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Original Articles
The association between the consumption of raw Kudoa septempunctata–infected farmed Paralichthys olivaceus and gastrointestinal symptoms
Jihye An, En-Joo Jung, Soon-Ok Lee, Jong-Hoon Choi, Jung Hee Kim, Sung-Jong Hong, JungHee Hong, Jung-Won Ju, Hyungjun Kim, Kwang-Pil Ko
Epidemiol Health. 2026;48:e2026003.   Published online January 19, 2026
DOI: https://doi.org/10.4178/epih.e2026003
  • 1,323 View
  • 80 Download
AbstractAbstract AbstractSummary PDF
Abstract
OBJECTIVES
<i>Kudoa septempunctata</i> has been identified as the causative agent of food poisoning following the consumption of raw farmed <i>Paralichthys olivaceus</i>. However, cohort studies providing robust evidence for an association between <i>K. septempunctata</i> and gastrointestinal symptoms remain limited. This prospective cohort study investigated the association between the consumption of <i>K. septempunctata</i>–infected farmed <i>P. olivaceus</i> and the occurrence of gastrointestinal symptoms.
METHODS
Individuals who purchased raw farmed <i>P. olivaceus</i> between 2020 and 2021 were selected as the study population. Study data included 2 rounds of questionnaire surveys administered before and after consumption, 2 muscle specimens obtained from each purchased fish, and human biological specimens collected from individuals who developed gastrointestinal symptoms within 24 hours after consumption. Data were analyzed using the chi-square test and t-test, and the association between consumption of <i>K. septempunctata</i>–infected farmed <i>P. olivaceus</i> and gastrointestinal symptoms was evaluated using relative risk estimates between exposure groups.
RESULTS
The relative risk of gastrointestinal symptoms associated with exposure to <i>K. septempunctata</i>–infected <i>P. olivaceus</i> ranged from 71.2 (95% confidence interval [CI], 27.0 to 178.6) to 124.5 (95% CI, 43.5 to 355.0) across the 2 case definitions. A strong and statistically significant association was observed between exposure to <i>K. septempunctata</i>–infected <i>P. olivaceus</i> and the development of acute gastrointestinal symptoms.
CONCLUSIONS
These findings indicate both an association and a causal relationship between consumption of <i>K. septempunctata</i>–infected farmed <i>P. olivaceus</i> and the onset of gastrointestinal symptoms.
Summary
Korean summary
본 연구는 Kudoa septempunctata에 감염된 광어회 섭취가 위장관 증상과 연관되며, 감염 강도와 섭취량에 따라 증상의 중증도가 증가한다는 전향적 근거를 제시한다. 이러한 결과는 역학적 공백을 보완하며, 감시체계 강화와 예방 중심의 정책 마련의 필요성을 강조한다.
Key Message
This study provides prospective evidence that consumption of raw halibut infected with Kudoa septempunctata is associated with gastrointestinal symptoms, with the severity of symptoms increasing with the intensity of infection and the amount consumed. These results address a gap in epidemiological knowledge and highlight the need for strengthened surveillance systems and prevention-focused policies.
Association between smoking and the risk of dental implant failure in Korean adults: a nationwide cohort study
Yu-Rin Kim, Minkook Son, Hyeon Ji Kim, Seon-Rye Kim
Epidemiol Health. 2026;48:e2026002.   Published online January 14, 2026
DOI: https://doi.org/10.4178/epih.e2026002
  • 3,613 View
  • 159 Download
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
We evaluated the associations of smoking status, intensity, duration, and cumulative exposure with the risk of dental implant failure in Korean adults.
METHODS
This retrospective cohort study utilized the National Health Insurance Service–Health Screening Cohort (2016–2019). Overall, 23,573 individuals who had completed the dental implant process were included. Smoking status was categorized as non-smoker, ex-smoker, or current smoker. Smoking intensity, duration, and cumulative exposure were classified using standardized thresholds (>10 cigarettes per day, >10 years, and >10 pack-years). Implant failure was defined as reimplantation or removal. Cox proportional hazards models were applied to estimate hazard ratios (HRs) and 95% confidence intervals (CIs), adjusting for demographic, clinical, and behavioral covariates.
RESULTS
During follow-up, 605 implant failures occurred: 344 in non-smokers, 182 in ex-smokers, and 79 in current smokers. The corresponding incidence rates per 1,000 person-years were 11.56, 16.54, and 22.33, respectively. Current smoking was significantly associated with higher implant failure risk (adjusted HR, 1.59; 95% CI, 1.20 to 2.09), while ex-smokers displayed a non-significant increase (adjusted HR, 1.16; 95% CI, 0.94 to 1.45). A dose–response relationship was observed: smoking more than 10 cigarettes per day, smoking for more than 10 years, or exceeding 10 pack-years was associated with significantly increased risk.
CONCLUSIONS
Smoking is a significant, dose–dependent risk factor for dental implant failure in Korean adults. Current smokers have the highest risk; smoking cessation may reduce adverse outcomes. These findings emphasize the importance of detailed smoking assessments and cessation counseling in implant care and public health strategies.
Summary
Korean summary
본 연구는 치아 임플란트를 시행한 성인들을 대상으로 흡연 상태(현재, 과거, 비흡연)와 흡연 강도, 기간, 누적 노출량에 따른 임플란트 실패 위험의 차이를 분석하였다. 분석 결과, 비흡연자에 비하여 현재 흡연자, 하루 10개피 이상 흡연자, 10년 이상 장기 흡연자, 10갑년 이상 누적 흡연자에서 임플란트 실패 위험이 유의하게 높았다. 특히, 여성의 경우 흡연이 임플란트 실패에 미치는 영향이 남성보다 크게 나타났다. 반면, 과거흡연자는 통계적으로 유의한 연관성을 보이지 않았다. 이러한 결과는 구강건강 증진과 임플란트의 성공적 예후를 위해 흡연자의 금연지도가 필수적임을 시사한다.
Key Message
This study examined differences in implant failure risk according to smoking status (current, former, never) and smoking intensity, duration, and cumulative exposure among adults who underwent dental implant placement. Compared with never-smokers, the risk of implant failure was significantly higher in current smokers, those who smoked ≥10 cigarettes/day, long-term smokers (≥10 years), and individuals with ≥10 pack-years of cumulative smoking exposure. Notably, the adverse impact of smoking on implant failure was greater in women than in men. In contrast, former smoking was not statistically associated with implant failure. These findings underscore the need for structured smoking-cessation counseling to improve oral health and optimize implant prognosis.
Socioeconomic status and adverse pregnancy outcome increase the risk of long-term cardiovascular disease: an analysis using the UK Biobank
Ji Hoi Kim, Un Yung Choi, Jeesun Lee, Manu Shivakumar, Dokyoon Kim, Kue Hyun Kang, So-hee Kim, Haibin Bai, Chan-Wook Park, Joong Shin Park, Juwon Lim, Jeehoon Kang, Soo Heon Kwak, Seung Mi Lee
Epidemiol Health. 2025;47:e2025075.   Published online December 25, 2025
DOI: https://doi.org/10.4178/epih.e2025075
  • 3,691 View
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AbstractAbstract PDFSupplementary Material
Abstract
OBJECTIVES
Adverse pregnancy outcomes (APOs) and low socioeconomic status (SES) are both associated with an increased long-term risk of atherosclerotic cardiovascular disease (ASCVD). In this analysis, we evaluated whether the association between a history of APO and ASCVD risk varies across different SES groups.
METHODS
We conducted this analysis using data from the UK Biobank, a large prospective cohort including participants aged 40 years to 69 years recruited between 2006 and 2010, with ongoing follow-up. APOs included hypertensive disorders of pregnancy, gestational diabetes mellitus, low birth weight (<2.5 kg), and stillbirth. At enrollment, SES was assessed using the following indicators: household income, education, employment, and Townsend Deprivation Index. The adjusted hazard ratio (aHR) for new-onset ASCVD was analyzed according to history of APO and SES categories.
RESULTS
Among 146,064 women, those with a history of APO had a higher risk of new-onset ASCVD and overall lower SES—including lower income, less education, higher unemployment, and greater deprivation—compared with those without APO (p<0.001). The increased ASCVD risk associated with APO history was significant only in the low SES group (aHR, 1.26; 95% confidence interval [CI], 1.16 to 1.36), but not in the high SES group (aHR, 1.07; 95% CI, 0.74 to 1.55, p=0.716).
CONCLUSIONS
We found that women with low SES were more vulnerable to the adverse effects of APO history, resulting in a greater increase in ASCVD risk. This study highlights the need for SES-tailored preventive policies to reduce long-term cardiovascular disease in women with a history of APO.
Summary
Cohort Profile
Cohort profile: the KDCA-Tuberculosis-NHIS cohort linking tuberculosis surveillance and health insurance data in Korea
Dawoon Jeong, Jinsun Kim, Seung Won Lee, Hongjo Choi, Hojoon Sohn, Jieun Kim, Hyewon Lee, Hyeran Jeong, Seung Eun Lee, Young-joon Park, Jaiyong Kim, Eun Mi Kim, Minji Koo, Hoyeon Jang, Young Ae Kang
Epidemiol Health. 2025;47:e2025071.   Published online December 13, 2025
DOI: https://doi.org/10.4178/epih.e2025071
  • 2,669 View
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  • 1 Web of Science
  • 1 Crossref
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
Despite a steady decline in incidence, tuberculosis (TB) remains a substantial public health burden in Korea, particularly among older adults. Existing national TB surveillance systems lack sufficiently comprehensive data to assess long-term outcomes and health disparities. The K-TB-N cohort integrates data from 3 national sources: the Korean Tuberculosis Surveillance System (2011-2022), the National Health Insurance Database (2010-2022), and mortality data from Statistics Korea (2010-2022). After data cleaning and linkage, the final cohort included 373,812 patients (375,440 episodes) with either drug-susceptible TB or drug- resistant TB. TB notifications declined by approximately 60% over the study period, while the median patient age continued to rise. Treatment success improved over time, accompanied by reductions in lost to follow-up. However, mortality during treatment increased, with more than half of deaths attributed to non-TB causes such as pneumonia, cancer, and cardiovascular disease. Post-treatment mortality also remained high, particularly among patients with drug-resistant TB. The K-TB-N cohort provides a comprehensive, linked dataset for advancing research on TB epidemiology, treatment outcomes, comorbidities, and health disparities. It enables evaluations of public health interventions, long-term prognosis, and strategies for post-TB care. This cohort will remain a valuable resource for shaping data-driven TB control policies in aging and high-burden settings.
Summary
Korean summary
- K-TB-N 코호트는 결핵 신고자료, 건강보험청구자료, 통계청 사망자료를 연계한 국내 최초의 전국단위 결핵 통합자료 코호트이다. - 이 코호트를 결핵 치료 성과와 치료 종료 이후 사망을 포함한 장기예후 분석이 가능하다. - 코호트에 포함된 2011-2022년 사이, 결핵 발생은 60% 감소하였고, 결핵 환자의 평균 연령은 증가하였다. 결핵 치료 중 사망율은 증가하였는데, 사망원인의 50% 이상은 비결핵성 사망이었다.
Key Message
- The K-TB-N cohort is the first national-level integrated TB cohort in South Korea that combines three distinct datasets, overcoming the limitations of single-source TB registries. - The linkage of clinical data (KTB-Surv), health insurance claims (NHID), and mortality records (Statistics Korea) allows long-term tracking of treatment outcomes and post-treatment mortality. - TB notifications declined by ~60% during the study period, while the median patient age increased. - The mortality during TB treatment rose, with over half of deaths attributed to non-TB causes.

Citations

Citations to this article as recorded by  
  • Suicide risk in people with tuberculosis in Republic of Korea: a nationwide cohort, 2012–2021
    Chiwook Chung, Seung Won Lee, Dawoon Jeong, Hongjo Choi, Hojoon Sohn, Young Ae Kang
    Infectious Diseases of Poverty.2026;[Epub]     CrossRef
Original Articles
Dental implant removal rates and related factors in older adults in Korea: a cross-sectional study using National Health Insurance Sharing Service database
Hyang-Ah Park, A-Rang Lim, Jae-In Ryu
Epidemiol Health. 2025;47:e2025064.   Published online December 3, 2025
DOI: https://doi.org/10.4178/epih.e2025064
  • 3,393 View
  • 62 Download
AbstractAbstract AbstractSummary PDF
Abstract
OBJECTIVES
Dental implants have been covered by the National Health Insurance for older adults in Korea since 2014. As the number of implant treatments has increased, the occurrence of related complications has also grown. While many clinical studies have examined mechanical and biological complications, few epidemiological studies using national data have identified population-level risk factors. This study aimed to determine the dental implant removal rate and related factors among older adults based on the Andersen Behavioral Model.
METHODS
A cross-sectional analysis was conducted using the National Health Insurance Service–National Sample Cohort. Logistic regression analyses were performed to identify factors associated with implant removal. Unadjusted and stepwise cumulative models were applied for predisposing, enabling, and need factors. All analyses were conducted using SPSS version 26.0, with statistical significance set at α=0.05.
RESULTS
The overall dental implant removal rate among older adults was approximately 0.4%. Higher removal rates were observed among males, those aged 65-69, current smokers, individuals with diabetes, and the self-employed group with higher income levels. Current smokers had 1.75 times higher odds of implant removal (95% confidence interval, 1.39 to 2.22) than non- smokers or former smokers.
CONCLUSIONS
Targeted education, management, and preventive interventions for high-risk groups, including smokers and patients with diabetes, are necessary to improve implant success and reduce complications. These findings provide population- based evidence to inform public health strategies that promote successful implant outcomes among older adults.
Summary
Korean summary
이 연구는 국가 단위의 빅데이터 코호트를 이용해 치과 임플란트 제거에 관해 시행한 선행 연구가 없었기 때문에 국가 빅데이터를 활용해 치과 임플란트 제거율과 관련 요인을 파악하기 위해 Anderson Model을 기반으로 다요인 분석을 실시하였다. 전체 치과 임플란트 제거율은 약 0.4%였으며, 남성, 젊은 연령, 건강보험 가입자, 상위 소득분위 자영업자, 당뇨병, 흡연, 유산소 신체 활동 실천자에서 더 높게 나타났다. 특히 현재 흡연자인 경우 치과 임플란트 제거율을 경험할 확률이 1.8배 높았다. 따라서, 치과 임플란트 시술의 성공률을 높이기 위해서는 위험요인에 대해 명시한 가이드라인 제작이 필수적이다.
Key Message
This study conducted a multifactorial analysis based on the Andersen model to identify factors associated with dental implant removal using national big data, addressing the lack of prior studies that examined these determinants sufficiently. The dental implant removal rate among all subjects was approximately 0.4%, and higher removal rates were observed among men, younger individuals, those receiving medical benefits, the self-employed group with higher income quintiles, and individuals with diabetes, smoking habits, or engagement in aerobic physical activity. Current smokers had a 1.8-fold higher probability of implant removal. These findings reinforce the importance of developing and implementing guidelines to increase the success rate of dental implants.
Age-period-cohort analysis of dietary sodium, potassium, and sodium-to-potassium ratio in Korea
Hee Ju Jun, Shieon Kim, Garam Jo
Epidemiol Health. 2025;47:e2025062.   Published online November 4, 2025
DOI: https://doi.org/10.4178/epih.e2025062
  • 3,049 View
  • 102 Download
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Excessive sodium and insufficient potassium consumption are major dietary contributors to hypertension (HTN) and cardiovascular diseases. The sodium-to-potassium ratio is a known predictor of blood pressure (BP) and HTN. This study evaluated 16-year-trends in dietary sodium, potassium, and the sodium-to-potassium ratio, and their associations with BP and HTN in Korea.
METHODS
Data from 76,484 participants aged 19-79 years were obtained from the Korea National Health and Nutrition Examination Survey conducted in 2007-2022. Sodium and potassium intake were assessed using 24-hour recalls, and the sodium- to-potassium ratio was calculated. All values were energy-adjusted using the residual method. Age-period-cohort (APC) models were used to analyze temporal trends. Associations with BP and HTN were examined using multivariate linear and logistic regression models, adjusting for confounders.
RESULTS
Energy-adjusted sodium intake decreased across all age groups, and potassium slightly increased in the recent 5 years, though both remained suboptimal relative to recommendations. APC analyses showed increasing potassium intake with age and a reversed U-shape cohort pattern. The sodium-to-potassium ratio decreased with age and calendar year but increased in recent cohorts. A higher sodium-to-potassium ratio was strongly associated with elevated systolic (β=0.028, p<0.001) and diastolic BP (β=0.036, p<0.001), and increased odds of HTN (odds ratio, 1.19; 95% confidence interval, 1.07 to 1.33). A linear association appeared when the sodium-to-potassium ratio exceeded 1.00 in the spline model.
CONCLUSIONS
Despite improvements, sodium intake remains excessive, and potassium insufficient, particularly in younger adults and recent cohorts. Public health interventions should prioritize reducing sodium and promoting potassium-rich foods to reduce cardiovascular risk.
Summary
Korean summary
한국 성인의 나트륨 섭취는 지난 16년간 감소했지만 여전히 과도한 수준이고, 칼륨 섭취는 최근 증가했으나 권장량에 미치지 못했습니다. 연령·기간·코호트(APC) 분석 결과, 나트륨-칼륨 비율이 최근 출생 코호트에서 높아지는 경향을 보였습니다. 나트륨-칼륨 비율이 높을수록 혈압 상승과 고혈압 위험 증가가 유의하게 연관되는 만큼, 공중보건적 관리가 필요합니다.
Key Message
Over the past 16 years, sodium intake among Korean adults has decreased but remains high, while potassium intake has recently increased yet still falls below recommended levels. Age-period-cohort (APC) analyses showed that the sodium-to-potassium ratio has tended to increase in more recent cohorts. Because a higher sodium-to-potassium ratio is significantly associated with elevated blood pressure and a higher risk of hypertension, targeted public health efforts are needed.
Association between secondhand smoke exposure and incidence of metabolic syndrome: analyses of Korean Genome and Epidemiology Study (KoGES) data
Seungmi Choi, Sanghyuk Bae
Epidemiol Health. 2025;47:e2025041.   Published online July 29, 2025
DOI: https://doi.org/10.4178/epih.e2025041
  • 4,704 View
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Secondhand smoke exposure remains a major public health concern and is linked to various chronic diseases, including metabolic syndrome (MetS). Although smoking rates have declined, exposure to secondhand smoke remains common and poses significant health risks to non-smokers. This study investigated the association between secondhand smoke exposure and the incidence of MetS using longitudinal data from a community-based cohort in Korea.
METHODS
We utilized data from the Korean Genome and Epidemiology Study, collected biennially between 2001 and 2020. Of 10,030 adults aged 40-69 years, a total of 3,042 never-smokers without pre-existing MetS were included. Secondhand smoke exposure was assessed through self-reported questionnaires. Cox proportional hazards models were employed to estimate hazard ratios (HRs) and 95% confidence intervals (CIs), adjusting for potential confounders.
RESULTS
During follow-up, 638 participants in the secondhand smoke exposure group developed MetS. Those exposed to secondhand smoke had a significantly higher risk of developing MetS compared to the non-exposed group (HR, 1.15; 95% CI, 1.02 to 1.27). Among MetS components, secondhand smoke exposure was significantly associated with increased risks of hypertension (HR, 1.13; 95% CI, 1.00 to 1.28) and hyperglycemia (HR, 1.19; 95% CI, 1.03 to 1.37). Although home exposure was not significantly associated with MetS risk, workplace exposure to secondhand smoke demonstrated a dose-response relationship according to exposure frequency and duration.
CONCLUSIONS
Our findings suggest that secondhand smoke exposure may increase the risk of developing MetS. These results underscore the importance of strengthening regulations on secondhand smoke in public places and raising social awareness of its detrimental effects on non-smokers.
Summary
Korean summary
40–69세 한국 성인 비흡연자 3,042명을 대상으로 한 지역사회 기반 코호트 연구에서, 간접흡연 노출은 대사증후군 발생 위험을 높이는 것으로 나타났다. 특히 고혈압과 고혈당 위험이 증가했으며, 직장 내 간접흡연 노출은 노출 빈도와 기간에 따른 용량-반응 관계를 보였다. 이러한 결과는 비흡연자를 보호하기 위한 간접흡연 규제 강화와 사회적 인식 제고의 필요성을 강조한다.
Key Message
In a community-based Korean cohort of 3,042 never-smokers aged 40–69 years, secondhand smoke exposure was associated with a higher risk of developing metabolic syndrome. Risks were particularly elevated for hypertension and hyperglycemia, and workplace exposure showed a dose-response relationship. These findings highlight the need for stronger regulations and public awareness to protect non-smokers from secondhand smoke.
Cohort Profiles
Cohort profile update: the Korean Cancer Prevention Study-II (KCPS-II) biobank
Heejin Kimm, Keum Ji Jung, Wes Spiller, Yeun Soo Yang, So Young Kim, Min Young Park, Sun Mi Lee, Sun Ha Jee
Epidemiol Health. 2025;47:e2025040.   Published online July 29, 2025
DOI: https://doi.org/10.4178/epih.e2025040
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
Chronic diseases such as cancer and cardiovascular disease have a substantial impact on mortality and global disease burden. The Korean Cancer Prevention Study-II (KCPS-II) biobank was established to investigate these chronic diseases, with a particular focus on metabolic risk factors. Recently, genetic information reflecting diverse ancestries has been incorporated to support a precision medicine approach. These data can be leveraged to identify variation in causal effects among different ancestral groups, thereby informing the development of more effective, ancestry-specific treatments. From 2004 to 2013, baseline data were collected from 156,701 individuals aged 20-85 years, recruited from 18 health promotion centers across Korea. Outcome data are routinely obtained from Statistics Korea (mortality data), the National Cancer Center (cancer registry data), and the National Health Insurance Service (morbidity data). Additionally, new participants have been enrolled since 2022 as part of an ongoing expansion. This population-based cohort, enriched with genetic data, provides a robust foundation for research aimed at elucidating causal relationships in chronic disease.
Summary
Korean summary
· 한국 암 예방 연구 II 바이오 뱅크에는 한국 전역의 18개 건강 검진 센터에서 모집한 20~85세의 156,701명의 참여자가 포함되어 있다. · 모집 시 기준 측정에는 사회 경제적, 병력, 행동적, 생리적 및 혈액 샘플 데이터가 포함되어 있으며, 이들의 유전 분석이 완료되었다. · 한국 암 예방 연구 II는 현재 참여자를 모집하고 있는 진행 중인 코호트이며, 사망률 외에도 심혈관 및 암 이환율을 포함한 2차 자료 연계를 통해 후속 데이터를 사용할 수 있다. · 본 코호트를 통해 한국인의 역학 자료와 유전 자료를 이용하여 질병에 대한 매커니즘을 확인하고 질병 예방 및 극복에 대한 과학적 근거를 창출할 것으로 기대한다.
Key Message
· The Korean Cancer Prevention Study II (KCPS-II) Biobank comprises 156,701 adults aged 20–85 years, recruited from 18 health examination centers nationwide. · Baseline data include socioeconomic, medical history, behavioral, physiological, and blood sample information, with completed genetic analyses. · KCPS-II is an ongoing cohort with follow-up through linkage to secondary data on mortality, cardiovascular events, and cancer incidence. · This resource enables the integration of epidemiological and genetic data to investigate disease mechanisms and provide scientific evidence for prevention and control in the Korean population.
The 2019 Rio Grande birth cohort: profile of a Brazilian 5-year study on mental health conditions
Rafaela Costa Martins, Francine dos Santos Costa, Cauane Blumenberg, Thais Martins-Silva, Romina Buffarini, Juraci Almeida Cesar, Christian Loret de Mola
Epidemiol Health. 2025;47:e2025039.   Published online July 21, 2025
DOI: https://doi.org/10.4178/epih.e2025039
  • 6,350 View
  • 85 Download
  • 2 Web of Science
  • 1 Crossref
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
We established the 2019 Rio Grande birth cohort to investigate the life course epidemiology of mental health and its intergenerational transmission. In 2019, we systematically identified all hospital births in the city of Rio Grande, located in Southern Brazil. Mothers who delivered a singleton liveborn child were administered a standardized, face-to-face questionnaire. In 2020, we conducted 2 follow-up assessments (WebCOVID-19 1 and 2), a third in 2021-22 (WebCOVID-19-3), and a fourth in 2023-24 (WebPOST-COVID). Across these follow-ups, we collected data on socio-demographic, environmental, and behavioral factors pertaining to both mother and child, as well as maternal mental health. Child mental health and development were specifically evaluated during the fourth follow-up. At baseline, 2,051 mothers were interviewed. Response rates for the online follow-ups were 54.1%, 51.1%, 48.7%, and 34.6%, respectively. In WebCOVID-19-3, the highest prevalence rates for depression (34.7%) and anxiety (33.1%) were observed. This cohort provides novel insights into maternal mental health, child development, and post-coronavirus disease 2019 behaviors, emphasizing culturally specific risk factors. Our findings are based on both published and ongoing studies. Data may be requested upon reasonable request.
Summary
Key Message
The 2019 Rio Grande Birth Cohort is a prospective study that has been following over 2,000 mothers and their children since 2019. It is designed specifically to understand the intergenerational transmission of mental health problems. The cohort's unique design combines detailed face-to-face questionnaires at baseline with remote, web-based follow-ups, and serves as a comprehensive overview of the cohort's methodology, data collection instruments, and study design, demonstrating its potential to generate valuable insights into maternal and child health.

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  • Changes in habits among mothers during the period of social isolation due to COVID-19 in the municipality of Rio Grande, Rio Grande do Sul, Brazil
    Jefferson Sales da Silva, Pâmela Moraes Volz, Rafaela Costa Martins, Francine dos Santos Costa, Cauane Blumenberg, Thais Martins Silva, Romina Buffarini, Lorena Goulart Vieira, Patricia Cota Lima, Zulema Mamani Condori, Caroline Lisset Dominguez Herido, C
    Revista Brasileira de Epidemiologia.2025;[Epub]     CrossRef
Original Article
Occurrence rate and estimated economic burden of pulp and periapical disease treatment among Korean older adults: a national population-based retrospective study
Hyeonjeong Go, Masae Kuboniwa, Youn-Hee Choi
Epidemiol Health. 2025;47:e2025035.   Published online July 3, 2025
DOI: https://doi.org/10.4178/epih.e2025035
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AbstractAbstract AbstractSummary PDF
Abstract
OBJECTIVES
Maintaining healthy dentition is essential for the overall health of older adults. Treatment of pulp and periapical disease (PPD) is crucial for preserving teeth. This study assessed the occurrence rate and economic burden of PPD treatment in an older Korean population.
METHODS
Data were obtained for adults aged ≥65 years from the Korean National Health Insurance Services from 2014 to 2018. The occurrence rate was defined as the proportion of individuals who received ≥1 PPD treatment. The economic burden was estimated using both direct and indirect expenditures, calculated from a societal perspective. Regression analysis was performed to evaluate yearly trends in occurrence rate and economic burden.
RESULTS
Direct costs, which included insured and non-insured medical expenses, ranged from US$13.79 million to US$10.47 million. Indirect costs, comprising transportation and time costs, ranged from US$0.89 million to US$0.80 million. Total costs declined from US$14.68 million to US$11.36 million. The occurrence rate of PPD treatment decreased significantly from 1.24% to 0.91% (p<0.05). The economic burden also demonstrated a statistically significant downward trend, with total PPD costs decreasing from 0.00099% to 0.00066% of Korea’s GDP, and from 0.63% to 0.30% of the annual total dental care benefit costs between 2014 and 2018 (p<0.05).
CONCLUSIONS
The occurrence rate and estimated economic burden of PPD treatment significantly decreased among older Korean adults from 2014 to 2018. Conservative approaches to tooth preservation contribute to more effective oral health policies and help reduce the economic burden of oral disease treatments in an aging society.
Summary
Korean summary
· 한국 노년층에서 치수 및 치근단 질환 치료의 발생률과 경제적 부담은 연구 기간 동안 통계적으로 유의미하게 감소했습니다. · 이러한 연구 결과는 보존적 치과 치료가 고령화 사회에서 구강 질환으로 인한 경제적 부담을 줄이는 효과적인 구강 보건 정책이 될 수 있음을 시사합니다.
Key Message
· The occurrence rate and economic burden of pulp and periapical disease (PPD) treatment among older Korean adults have shown a statistically significant decrease over the study period. · These findings suggest that conservative dental treatment can serve as an effective oral health policy for reducing the economic burden of oral diseases in an aging society.
COVID-19: Cohort Profile
Cohort profile: Cardiovascular Metabolic Etiological Research Center COVID-19 Mental Health Survey (CC-MHS)
Sun Jae Jung, Dongkyu Lee, Ji Su Yang, Sunghyuk Kang, Hyejin Kim, Jeong Hyun Ahn, Yunseong Heo, Jieun Noh, Changhyun Kim, Hyeon Chang Kim
Epidemiol Health. 2025;47:e2025033.   Published online June 30, 2025
DOI: https://doi.org/10.4178/epih.e2025033
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AbstractAbstract AbstractSummary PDF
Abstract
The Cardiovascular Metabolic Etiological Research Center COVID-19 Mental Health Survey (CC-MHS) is a comprehensive longitudinal cohort study investigating the mental health impact of the coronavirus disease 2019 pandemic by utilizing pre-existing baseline data from the Cardiovascular Metabolic Etiological Research Center cohort (2013-2018). This study assesses physical health, lifestyle changes, and mental health using validated tools, including the Patient Health Questionnaire-9, Generalized Anxiety Disorder-7, and the PTSD Checklist for DSM-5, and evaluates a population of urban and suburban Korean participants across multiple dimensions. Through online surveys, the research identified gender-specific social support mechanisms, showing that men benefit from larger social networks, whereas women derive protective effects from stronger emotional connections. Key findings underscore complex interactions among demographic factors, psychological variables, and public health responses, especially in the context of vaccination attitudes and trust in pandemic management. The CC-MHS delivers critical insights into mental health trajectories during global health crises, offering valuable evidence for developing adaptive public health strategies and for understanding the intricate relationships between individual psychological resilience and broader societal health challenges.
Summary
Korean summary
본 CC-MHS 코호트는 팬데믹 이전 4,060명 대상 CMERC 기초자료 활용하였다 본 CC-MHS 코호트는 우울, 불안, PTSD 등 정신건강 평가를 7차례 추적조사하였다. 본 코호트에서는 성별 보호요인과 사회적 지지·신뢰의 중요성 규명하였다.
Key Message
In CC-MHS, we utilized pre-pandemic baseline data from 4,060 adults in the CMERC cohort. We conducted 7 waves of mental health surveys assessing depression, anxiety, PTSD, and resilience. In this cohort, we identified gender-specific protective factors and emphasized the importance of social support and trust.
Original Article
Mortality burden attributable to long-term exposure to fine particulate matter among older adults in Korea
Jongmin Oh, Jisun Myung, Changwoo Han, Hyun-Joo Bae, Soontae Kim, Yun-Chul Hong, Dong-Wook Lee, Youn-Hee Lim
Epidemiol Health. 2025;47:e2025028.   Published online May 28, 2025
DOI: https://doi.org/10.4178/epih.e2025028
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
This study aimed to evaluate the association between long-term exposure to particulate matter with an aerodynamic diameter <2.5 μm (PM<sub>2.5</sub>) and cause-specific mortality among older adults in Korea, providing insights into the evolving public health burden in an aging society.
METHODS
We analyzed national insurance claims data spanning 2010-2019. Modeled PM<sub>2.5</sub> concentrations were assigned to participants according to their residential districts. We employed time-varying Cox proportional hazard models, using age as the time scale, adjusted for potential confounders. Six cause-specific mortalities were considered: ischemic heart disease (IHD), stroke, chronic obstructive pulmonary disease (COPD), acute lower respiratory infection (ALRI), lung cancer (LC), and type 2 diabetes mellitus (T2DM). Annual excess deaths attributable to long-term PM<sub>2.5</sub> exposure were calculated.
RESULTS
A total of 5,360,032 older adults were followed from 2010 to 2019. Hazard ratios (HRs) per 10 μg/m3 increase in 12-month PM<sub>2.5</sub> concentration were as follows: IHD, 1.068 (95% CI, 1.040 to 1.097); stroke, 1.023 (95% CI, 1.003 to 1.043); ALRI, 1.050 (95% CI, 1.026 to 1.076); COPD, 1.114 (95% CI, 1.072 to 1.157); T2DM, 1.046 (95% CI, 1.007 to 1.086); and LC, 0.972 (95% CI, 0.948 to 0.996). Excess deaths attributable to long-term PM<sub>2.5</sub> exposure were estimated at 4,888 (95% CI, 2,304 to 7,323) in 2010 and 5,179 (95% CI, 2,585 to 7,648) in 2019.
CONCLUSIONS
Although PM<sub>2.5</sub> levels in Korea have shown a declining trend over the past decade, mortality among older adults associated with long-term PM<sub>2.5</sub> exposure has not significantly decreased, likely due to the rapid aging of the population.
Summary
Korean summary
2010–2019년 동안 대한민국 노인 536만 명 대상의 후향적 코호트 연구를 수행하였다. 장기적인 초미세먼지(PM2.5) 노출은 허혈성 심질환, 뇌졸중, 하기도 감염, 만성폐쇄성폐질환, 제2형 당뇨병으로 인한 사망 위험 증가와 관련성이 있었다. 연간 PM2.5 농도는 감소했으나, 고령화로 인해 PM2.5에 기인한 초과 사망은 2010년 4,888명에서 2019년 5,179명으로 증가하였다. 대기질 개선에도 불구하고 고령화로 인해 PM2.5로 인한 사망 부담은 여전히 중요한 공중보건 문제이다.
Key Message
A retrospective cohort of 5.36 million older adults was followed from 2010 to 2019 in Korea. Long-term PM2.5 exposure was associated with increased mortality from IHD, stroke, ALRI, COPD, and T2DM. Although annual PM2.5 concentrations declined, excess deaths rose from 4,888 in 2010 to 5,179 in 2019, largely driven by population aging. Despite improvements in air quality, the PM2.5-related mortality burden remains a significant public health concern due to population aging.

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  • Exposure to particulate matters and risk of diabetes-related mortality: a systematic review and meta-analysis
    Weifang Yang, Jing Li
    Environmental Health and Preventive Medicine.2026; 31: 18.     CrossRef
Cohort Profile
Cohort profile: a nationwide retrospective cohort of mortality in people living with HIV in Korea, 1985-2020
Taeyoung Kim, Yoonhee Jung, Koun Kim, Jung Wan Park, Jeonghee Yu, Sung-il Cho
Epidemiol Health. 2025;47:e2025002.   Published online January 2, 2025
DOI: https://doi.org/10.4178/epih.e2025002
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AbstractAbstract AbstractSummary PDF
Abstract
The increasing number of people living with human immunodeficiency virus (HIV) in Korea has prompted interest in using the national surveillance system as a database for studying their health. To investigate the relationships between socio-demographic and epidemiological characteristics and mortality rates, a nationwide retrospective cohort was formed by integrating surveillance data with the Cause of Death Statistics from Statistics Korea. This integration included incidence reports, epidemiological investigations, and death reports from the surveillance data, enriched with detailed mortality information from the Cause of Death data. The cohort comprised 17,199 adult Korean individuals diagnosed with HIV infection from 1985 to 2020. By the end of 2020, 2,721 of these individuals were confirmed deceased. The sex ratio of the study participants was 14.3:1.0 (male to female), with 78.2% being under 50 years old at the time of diagnosis. Sexual contact was identified as the primary transmission route, accounting for 75.7% of cases. HIV disease emerged as the predominant cause of death, representing two-thirds (1,817 of 2,721) of the fatalities, followed by injuries and trauma, malignancies, and cardiovascular diseases. Recommendations for further cohort studies may be submitted to the Korea Disease Control and Prevention Agency.
Summary
Korean summary
- 인체면역결핍바이러스 감염인들의 사망과 연관된 요인의 파악을 위해, 질병관리청의 국가 감시체계 데이터와 통계청 사망원인통계를 결합하여 후향적 코호트를 구성하였다. - 구성된 코호트에는 1985-2020년 중 발생이 보고된 대한민국 국적의 19세 이상 감염인 17,199명이 포함되었으며 이 중 2,721명의 사망이 감시체계와 사망원인통계에서 최종 확인되었고, 코호트 데이터는 이들의 사회인구학적 요인, 역학적 요인, 사망원인을 포함한 사망 관련 정보로 구성되어 있다. - 본 코호트에 기반한 연구를 통해 국내 거주하는 한국인 감염인들의 건강을 전반적으로 확인할 수 있을 것으로 생각되며, 감염인 중 사망 위험이 높은 취약군을 확인하는 등 국가 정책의 기반이 되는 과학적 근거를 생산할 수 있기를 기대한다.
Key Message
- By merging KDCA’s national surveillance data and the national mortality statistics, our retrospective cohort data have been established for identifying people living with HIV (PLHIV) at higher risk of mortality. - In the established cohort, incidence reports of 17,199 PLHIV aged 19 or older with Korean nationality and mortality reports of 2,721 were included. The cohort data were composed of their sociodemographic and epidemiologic characteristics, and mortality data including causes of death. - We expect further research based on the cohort to explore Korean PLHIV’s health and mortality risk, and to generate scientific evidence for national policymaking.
Original Article
Prospective association between handgrip strength in childhood and the metabolic syndrome score and insulin resistance indices in adolescence: an analysis based on the Ewha Birth and Growth Study
Seunghee Jun, Hyunjin Park, Hyelim Lee, Hye Ah Lee, Young Sun Hong, Hyesook Park
Epidemiol Health. 2025;47:e2025001.   Published online January 2, 2025
DOI: https://doi.org/10.4178/epih.e2025001
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Low handgrip strength (HGS) in children and adolescents might be associated with the risk of metabolic syndrome (MetS) and insulin resistance. This study prospectively evaluated the association between HGS in childhood and MetS in adolescence.
METHODS
Based on data from the Ewha Birth and Growth Study, this study analyzed HGS at ages 7 to 9 and metabolic indices at ages 13 to 15. In total, 219 participants were analyzed. The risk of MetS was evaluated using the continuous metabolic syndrome score (cMetS), and insulin resistance was assessed using fasting blood insulin and homeostasis model assessment of insulin resistance (HOMA-IR). Relative HGS in childhood was determined by dividing HGS by body weight and categorized as sex-specific quartiles.
RESULTS
This study found an inverse association between relative HGS levels in childhood and MetS and insulin resistance in adolescence. For each 1-group increase in relative HGS quartiles, cMetS (standarard [Std] β=-0.64, p<0.01), HOMA-IR (Std β=-0.21, p<0.01), and fasting blood insulin (Std β=-0.21, p<0.01) all decreased on average. These associations remained significant even after adjusting for confounding factors.
CONCLUSIONS
Our study showed a prospective association between HGS in childhood and the risk of MetS and insulin resistance in adolescence. It provides significant epidemiological evidence, emphasizing the importance of efforts to increase muscle strength from a young age to mitigate the risk of MetS and insulin resistance in adolescence.
Summary
Korean summary
본 연구는 소아기 악력 수준이 청소년기의 대사증후군 및 인슐린 저항성과 연관이 있음을 발견했음. 이러한 결과는 소아기 근력 향상이 향후 대사 위험을 완화하는데 중요함을 강조함.
Key Message
This study found that higher childhood relative handgrip strength was inversely associated with metabolic syndrome and insulin resistance in adolescence. The findings emphasize the importance of enhancing muscle strength early in life to mitigate metabolic risks.

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  • Joint associations of grip strength, lipid levels, and lipid-related genetic risk with atrial fibrillation
    Zihao Zhang, Jianfeng Huang, Xu Wang, Qing Li, Yirong Yang, Kuan Ning, Yifan Wang, Tanxiu Chen, Rui Xiong, Xinjie Liu, Shaolie Huang, Lijuan Deng, Pingping Shen, Yian Zhan, Shanhua Xiao, Wen-Quan Zou
    Lipids in Health and Disease.2026;[Epub]     CrossRef
Cohort Profile
Cohort study profile: a cohort of Korean atomic bomb survivors and their offspring
Hamin Lee, Jin-Wu Nam, Mi Kyung Kim, Inah Kim, Yu-Mi Kim, Boyoung Park
Epidemiol Health. 2024;46:e2024089.   Published online November 18, 2024
DOI: https://doi.org/10.4178/epih.e2024089
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AbstractAbstract AbstractSummary PDF
Abstract
The Korean Atomic Bomb Survivor Cohort (K-ABC) study was designed to investigate the health impacts of atomic bomb exposure on Korean survivors and to explore whether these effects are passed down genetically to their descendants. This paper outlines the study’s design, data collection methods, baseline socio-demographic characteristics, exposure status, and disease prevalence among the participants, based on survey responses and health examinations. From 2020 to 2024, a total of 2,544 individuals, comprising 1,109 atomic bomb survivors (G1), 1,193 children of G1 (G2), and 242 grandchildren of G1 (G3), consented to participate in the study. Of these, 1,828 participants (659 in G1, 927 in G2, and 242 in G3) completed the survey and underwent health examinations, representing a participation rate of 71.9%. Exposure information was gathered using a questionnaire and verified through records from the Korean Red Cross and a handbook issued by the Japanese government. Disease prevalence was determined based on participants’ self-reported physician diagnoses. This study presents details about the K-ABC study and provides baseline data on the participants recruited. These data will be valuable for interpreting the results of future K-ABC studies.
Summary
Korean summary
한국인 원폭피해자 코호트 연구는 1945년 일본에서 원자폭탄에 피폭된 원폭 피해자 1세와 이들의 자녀인 2세, 3세의 건강과 질병 위험도을 장기적으로 조사한다. 이를 위해 2020년부터 2023년까지 설문조사를 통해 정보를 수집하였고, 이후 설문조사와 함께 건강보험공단, 국립암센터, 통계청 등 공공 기관에서 보유하고 있는 데이터를 연계하여 추적관찰을 수행해 나갈 예정이다.
Key Message
The Korean atomic bomb survivor’s cohort study investigates the long-term health and disease risks of first generation atomic bomb survivors exposed in Japan in 1945, as well as their second generation and third generations. From 2020 to 2023, information was collected through surveys. Follow-up will be conducted through surveys and secondary data linkage from public institutions such as the National Health Insurance Service, the Korea Central Cancer Registry, and Statistics Korea.

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  • Inherited Trauma Across Generations: The Lived Experiences of Korean Second-Generation Atomic Bomb Survivors
    Youngsub Yoon, Sihyun Park
    Qualitative Health Research.2026;[Epub]     CrossRef
  • Validation of self-reported cancer diagnoses in the Korean Atomic Bomb Survivor Cohort study
    Hamin Lee, Jin-Wu Nam, Mi Kyung Kim, Inah Kim, Yu-Mi Kim, Boyoung Park
    Cancer Epidemiology.2025; 97: 102817.     CrossRef
Data Profile
Data profile: the Korean Workers’ Compensation-National Health Insurance Service (KoWorC-NHIS) cohort
Jeehee Min, Eun Mi Kim, Jaiyong Kim, Jungwon Jang, Youngjin Choi, Inah Kim
Epidemiol Health. 2024;46:e2024071.   Published online August 19, 2024
DOI: https://doi.org/10.4178/epih.e2024071
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AbstractAbstract AbstractSummary PDF
Abstract
The Korean Workers’ Compensation-National Health Insurance Service (KoWorC-NHIS) cohort was established to investigate the longitudinal health outcomes of Korean workers who have been compensated for occupational injuries or diseases. This cohort study, which utilized data spanning from 2004 to 2015, merged workers’ compensation insurance claim data with the National Health Insurance Database (NHID), encompassing 858,793 participants. The data included socio-demographic factors such as age, sex, income, address, insurance type, and disability grade. It also covered the types of occupational accidents, International Classification of Diseases, 10th revision codes for diseases or accidents, work tenure, industry, occupation code, and company size. Additional details such as the occupational hire date, date of claim, date of recognition, and affected body parts were recorded. The cohort predominantly consisted of male workers (80.0%), with the majority experiencing their first occupational accident in their 40s (27.6%) or 50s (25.3%). Notably, 93.1% of the cases were classified as occupational injuries. By integrating this data with that from the NHID, updates on health utilization, employment status, and income changes were made annually. The follow-up period for this study is set to conclude in 2045.
Summary
Korean summary
KoWorC-NHIS Cohort (산재보험-국민건강보험공단 코호트) 는 2004년부터 2015년까지 산업재해를 경험한 근로자들의 장기적인 건강 결과를 추적 조사하기 위해 구축된 코호트이다. 이 코호트에는 총 858,793명의 근로자가 등록되었으며, 대다수는 남성 (80%)이었고, 업무상 사고 (93.1%)를 경험한 것으로 나타났다. 이 코호트를 활용하여 산업재해 피해 근로자들의 장기적인 건강영향을 분석할 수 있으며, 취약 계층 근로자의 건강을 보호하기 위한 예방 정책 수립의 근거로 활용할 수 있다.
Key Message
The KoWorC-NHIS Cohort (Workers' Compensation Insurance-National Health Insurance Service Cohort) was established to track the long-term health outcomes of workers who experienced occupational injuries and illnesses from 2004 to 2015. The cohort includes a total of 858,793 workers, with the majority being male (80%) and having experienced occupational accidents (93.1%). This cohort can be used to analyze the long-term health effects on workers who have suffered occupational injuries, and can serve as evidence for establishing preventive policies to protect the health of vulnerable workers.

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  • Machine learning-based prediction of dissatisfaction after occupational injury: a retrospective cohort study using the nationwide Korean workers’ compensation insurance database
    Youjin Lee, Taeyeon Kim, Dahyeon Koo, Dougho Park
    BMJ Open.2025; 15(11): e103321.     CrossRef
Cohort Profile
Cohort profile: the Taiwan Initiative for Geriatric Epidemiological Research - a prospective cohort study on cognition
Pei-Iun Hsieh, Te-Hsuan Huang, Jeng-Min Chiou, Jen-Hau Chen, Yen-Ching Chen
Epidemiol Health. 2024;46:e2024057.   Published online June 25, 2024
DOI: https://doi.org/10.4178/epih.e2024057
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AbstractAbstract AbstractSummary PDF
Abstract
The Taiwan Initiative for Geriatric Epidemiological Research (TIGER) was founded in 2011 to elucidate the interrelationships among various predictors of global and domain-specific cognitive impairment, with the aim of identifying older adults with an increased risk of dementia in the preclinical phase. TIGER, a population-based prospective cohort, recruited 605 and 629 (total of 1,234) older adults (aged 65 and above) at baseline (2011-2013 and 2019-2022) of phase I and II, respectively. Participants have undergone structured questionnaires, global and domain-specific cognitive assessments, physical exams, and biological specimen collections at baseline and biennial follow-ups to date. By 2022, TIGER I has included 4 biennial follow-ups, with the participants comprising 53.9% female and having a mean age of 73.2 years at baseline. After an 8-year follow-up, the annual attrition rate was 6.1%, reflecting a combination of 9.9% of participants who passed away and 36.2% who dropped out. TIGER has published novel and multidisciplinary research on cognitive-related outcomes in older adults, including environmental exposures (indoor and ambient air pollution), multimorbidity, sarcopenia, frailty, biomarkers (brain and retinal images, renal and inflammatory markers), and diet. TIGER’s meticulous design, multidisciplinary data, and novel findings elucidate the complex etiology of cognitive impairment and frailty, offering valuable insights into factors that can be used to predict and prevent dementia in the preclinical phase.
Summary
Key Message
1. The Taiwan Initiative for Geriatric Epidemiological Research (TIGER), established in 2001, aims to fill the knowledge gap regarding the longitudinal associations between environmental exposure, clinical factors, and performance in global and cognitive domains. 2. TIGER has made significant findings in various aspects, including the effects of exposure to low-level air pollutants, indoor air quality, clinical factors (brain and retinal images, dental health), nutrition, and biomarkers on cognition over time. 3. TIGER's multidisciplinary data and advanced analysis elucidate the predictors of cognitive impairment, identifying older adults at increased risk of dementia in the preclinical phase for early prevention and intervention.

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  • Disturbing dreams and dementia incidence across diverse cohort studies: A COSMIC collaboration study
    Darren M. Lipnicki, Ashleigh S. Vella, Erico Castro‐Costa, Sergio Luis Blay, Maria Fernanda Lima‐Costa, Karen Ritchie, Elena Rolandi, Annalisa Davin, Michele Rossi, Ki Woong Kim, Ji Won Han, Dae Jong Oh, Ding Ding, Qianhua Zhao, Xiaowen Zhou, Yen‐Ching Ch
    Psychiatry and Clinical Neurosciences.2026;[Epub]     CrossRef
  • The spatial relationship between older adults’ cognitive function, air pollution, and neighbourhood environment: a case study of Tainan, Taiwan
    Tzuyuan Stessa Chao, Yi Sun, Hung Lin, Yuhsuan Lin
    Planning Practice & Research.2026; : 1.     CrossRef
  • Interactive effects of retinal biomarkers and sleep on cognition: longitudinal evidence from community-dwelling older adults
    Ting-Wen Chu, Yi-Ting Hsieh, Jeng-Min Chiou, Yao-Lin Liu, Yen-Ching Chen, Jen-Hau Chen
    GeroScience.2026;[Epub]     CrossRef
  • Addressing global diversity in dementia research with the COSMIC collaboration
    Darren M. Lipnicki, Ashleigh S. Vella, Jiyang Jiang, Louise Mewton, Annabel P. Matison, Karen A. Mather, Anbupalam Thalamuthu, Vibeke S. Catts, Rory Chen, Nikita Husein, Wei Wen, Nicole A. Kochan, John D. Crawford, Perminder S. Sachdev
    Neuroscience.2025; 582: 180.     CrossRef
Original Article
Comparison of HIV characteristics across 3 datasets: the Korea HIV/AIDS Cohort Study prospective, retrospective, and national reporting system
Yunsu Choi, Jun Yong Choi, Bo Youl Choi, Bo Young Park, Shin-Woo Kim, Joon Young Song, Jung Ho Kim, Sang Il Kim
Epidemiol Health. 2024;46:e2024055.   Published online June 18, 2024
DOI: https://doi.org/10.4178/epih.e2024055
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
The Korea HIV/AIDS Cohort Study has been conducted prospectively for 18 years. However, it faces limitations in representing the entire population of patients with human immunodeficiency virus (HIV) in Korea. To address these limitations and validate the study design, we analyzed characteristics across several HIV datasets.
METHODS
We compared epidemiological and clinical characteristics from 3 datasets: the Korea HIV/AIDS Cohort Study (dataset 1, n=1,562), retrospective cohort data (dataset 2, n=2,665), and the national HIV reporting system of the Korea Disease Control and Prevention Agency (KDCA) (dataset 3, n=17,403).
RESULTS
The demographic characteristics of age, sex, and age at HIV diagnosis did not differ significantly across datasets. However, dataset 3 contained a higher proportion of patients diagnosed after 2008 (69.5%) than the other datasets. Regarding transmission routes, same-sex contact accounted for a greater proportion of dataset 1 (59.8%) compared to datasets 2 (20.9%) and 3 (32.6%). The proportion of patients with CD4 T-cell counts below 200/mm<sup>3</sup> at HIV diagnosis was higher in datasets 1 (39.4%) and 2 (33.3%) compared to dataset 3 (16.3%). Initial HIV viral load measurements were not obtained for dataset 3.
CONCLUSIONS
The Korea HIV/AIDS Cohort Study demonstrated representativeness regarding the demographic characteristics of Korean patients. Of the sources, dataset 1 contained the most data on transmission routes. While the KDCA data encompassed all HIV patients, it lacked detailed clinical information. To improve the representativeness of the Korea HIV/AIDS Cohort Study, we propose expanding and revising the cohort design and enrolling more patients who have been recently diagnosed.
Summary
Korean summary
장기간 운영된 코호트 연구는 다양한 편향으로 인해 모집단의 대표성을 잃을 수 있다. 대표성을 높이기 위해서는 편향을 최소화하고 지속적으로 변화하는 임상 역학적 지침과 특성을 반영할 수 있어야 한다. 지난 18년간 운영된 한국 HIV/AIDS 코호트 연구에서는 코호트 연구 참여 기관에 방문하는 감염인 중 연구 참여자와 비참여자의 특성을 비교하고, 질병관리청 신고자료와의 분포를 비교한 결과, 코호트 연구에 참여하는 것만으로도 대상자 특성에 차이가 있음을 밝혔다. 이에 따라 편향을 최소화하고 대표성을 높일 수 있도록 코호트 연구 설계를 대대적으로 개편하고, 향후 지속될 연구 설계를 제안한다.

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  • Trends in cancer incidence among people with human immunodeficiency virus in South Korea: a nationwide National Health Insurance Service data-based study
    Yeon Jeong Jeong, Youn Jeong Kim, Sang Il Kim, Yoon Hee Jun, Boyoung Park, Yunsu Choi, Jun Yong Choi, Jung Ho Kim, Hyo Youl Kim, Jang Wook Sohn, Joon Young Song, Shin-Woo Kim, YeonJae Kim, Hee Jung Choi
    International Journal of Infectious Diseases.2026; 167: 108658.     CrossRef
  • Cohort profile: a nationwide retrospective cohort of mortality in people living with HIV in Korea, 1985-2020
    Taeyoung Kim, Yoonhee Jung, Koun Kim, Jung Wan Park, Jeonghee Yu, Sung-il Cho
    Epidemiology and Health.2025; 47: e2025002.     CrossRef
  • 한국 HIV/AIDS 코호트 연구의 과거, 현재, 그리고 미래
    윤수 최, 윤정 김, 보영 박, 준용 최, 신우 김, 준영 송, 보율 최, 상일 김
    Public Health Weekly Report.2025; 18(50): 23.     CrossRef
Cohort Profile
Korea Nurses’ Health Study and the health of reproductive-aged women: a cohort profile
Chiyoung Cha, Heeja Jung, Sue Kim, Jung Eun Lee, Kwang-Pil Ko, Eunyoung Cho, Hyun-Young Park, Joong-Yeon Lim, Bo Mi Song, Sihan Song, Soojin Park, Aram Cho
Epidemiol Health. 2024;46:e2024048.   Published online April 30, 2024
DOI: https://doi.org/10.4178/epih.e2024048
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AbstractAbstract AbstractSummary PDF
Abstract
The Korea Nurses’ Health Study (KNHS) is an ongoing, large-scale, prospective cohort study of women nurses, focusing on the effects of occupational, environmental, and lifestyle factors on the health of women. The first KNHS survey was performed in 2013-2014 (n=20,613). As of December 2023, 11 follow-up surveys have been conducted. Participants who were pregnant were asked to participate in the early pregnancy survey (n=2,179) and postpartum survey after giving birth (n=2,790). The main variables included socio-demographic, work-related, lifestyle, physical, mental, and women’s health factors. Blood, urine, and toenail samples were collected from a participant subgroup of the first survey (n=1,983). The subgroups of the second survey completed a food frequency questionnaire in 2019 (n=300) and 2021 (n=871). In 2020, a subgroup of the first survey answered a coronavirus disease 2019-related survey (n=975). To examine various health-related factors in young adults, new participants were added to the KNHS cohort in the 11th (n=1,000) and 12th (n=1,002) surveys. The KNHS cohort will help identify health and illness determinants in Korean women. Data can be accessed at https://coda.nih.go.kr/frt/index.do.
Summary
Korean summary
한국간호사건강연구(Korea Nurses’ Health Study, KNHS)는 2013년부터 수행되고 있는 대규모 전향적 추적관찰 코호트 연구이다. 본 연구는 질병력, 약물복용력, 임신력, 여성건강, 정신건강(우울, 스트레스, 피로 등), 생활습관(흡연, 음주, 신체활동, 수면 등), 근무특성을 조사하여 여성건강에 장기적으로 미치는 영향을 파악하고 한국 고유의 여성건강 결정요인을 도출하는 것을 목표로 한다.
Key Message
The Korea Nurses' Health Study (KNHS) is a large-scale, prospective cohort study that has been conducted since 2013. It measures various factors affecting reproductive-aged women, including disease history, medication usage, pregnancy, women's health characteristic, mental health (such as depression, stress, and fatigue), lifestyle characteristic (including smoking, drinking, and physical activity, sleep), and work-related characteristics. The study aims to understand the long-term impact on women's health and identify unique determinants of women's health specific to Korea.

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  • Do physical activity, psychological health, and food group intake change in early pregnancy before and during COVID-19? A secondary analysis of cohort data from the Korea Nurses’ Health Study
    Chiyoung Cha, Jung Eun Lee, Jin-hui Han
    Women's Health Nursing.2025; 31(1): 22.     CrossRef
  • Factors Affecting Nonresponse Among Female Participants in the Korea Nurses’ Health Study: Longitudinal Cohort Survey Study
    Young Taek Kim, Chiyoung Cha, Gumhee Baek, Bohye Kim, Bo Mi Song, Joong-Yeon Lim, Hyun-Young Park, Juh Hyun Shin
    JMIR Public Health and Surveillance.2025; 11: e68038.     CrossRef
Original Articles
Association of decreased estimated glomerular filtration rate with lung cancer risk in the Korean population
Soonsu Shin, Min-Ho Kim, Chang-Mo Oh, Hyejin Chun, Eunhee Ha, Hyo Choon Lee, Seong Ho Moon, Dong-Young Lee, Dosang Cho, Sangho Lee, Min Hyung Jung, Jae-Hong Ryoo
Epidemiol Health. 2024;46:e2024041.   Published online March 20, 2024
DOI: https://doi.org/10.4178/epih.e2024041
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Inconsistent results are available regarding the association between low estimated glomerular filtration rate (eGFR) and lung cancer risk. We aimed to explore the risk of lung cancer according to eGFR category in the Korean population.
METHODS
We included 358,293 adults who underwent health checkups between 2009 and 2010, utilizing data from the National Health Insurance Service-National Sample Cohort. Participants were categorized into 3 groups based on their baseline eGFR, as determined using the Chronic Kidney Disease Epidemiology Collaboration equation: group 1 (eGFR ≥90 mL/min/1.73 m<sup>2</sup>), group 2 (eGFR ≥60 to <90 mL/min/1.73 m<sup>2</sup>), and group 3 (eGFR <60 mL/min/1.73 m<sup>2</sup>). Incidences of lung cancer were identified using the corresponding codes from the International Classification of Diseases, 10th revision. Multivariate Cox proportional hazard models were employed to calculate the adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) for lung cancer incidence up to 2019.
RESULTS
In multivariate analysis, group 2 exhibited a 26% higher risk of developing lung cancer than group 1 (HR, 1.26; 95% CI, 1.19 to 1.35). Furthermore, group 3 demonstrated a 72% elevated risk of lung cancer relative to group 1 (HR, 1.72; 95% CI, 1.58 to 1.89). Among participants with dipstick proteinuria of 2+ or greater, group 3 faced a significantly higher risk of lung cancer than group 1 (HR, 2.93; 95% CI, 1.37 to 6.24).
CONCLUSIONS
Low eGFR was significantly associated with increased lung cancer risk within the Korean population. A particularly robust association was observed in individuals with severe proteinuria, emphasizing the need for further investigation.
Summary
Korean summary
이번 연구에서는 한국인 인구집단에서 단백뇨와 동반된 낮은 사구체 여과율이 페암의 발생 위험을 증가시켰다. 이는 신장기능의 저하가 폐암의 위험을 증가시킬 수 있음을 시사한다. 신장기능이 저하된 환자들의 면밀한 추적관찰이 필요할 수 있다.
Key Message
Our research found that lower estimated glomerular filtration rate with proteinuria increased the risk of lung cancer in a Korean population. These findings suggest that decreased kidney function may increase the risk of lung cancer, indicating the need for careful observation of patients with impaired kidney function.

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  • Mendelian randomization study of the relationship between blood and urine biomarkers and lung cancer
    Haihua Huang, Haijun Zheng
    Frontiers in Oncology.2024;[Epub]     CrossRef
Association between plant-based diets and the risk of coronary heart disease predicted using the Framingham Risk Score in Korean men: data from the HEXA cohort study
Khongorzul Ganbat, Bayarmaa Nasan Ulzii, Sangah Shin
Epidemiol Health. 2024;46:e2024035.   Published online February 28, 2024
DOI: https://doi.org/10.4178/epih.e2024035
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
This study investigated the potential correlation between 4 plant-based diet indices and the predicted risk of coronary heart disease (CHD) in Korean men using the Framingham Risk Score.
METHODS
The study included 12,356 men participants (aged ≥40 years) from the Health Examinees Study. Dietary intake was estimated using a validated food frequency questionnaire. Four plant-based diet indices were measured, including the overall plant-based diet index, the healthy plant-based diet index (hPDI), the unhealthy plant-based diet index (uPDI), and the pro-vegetarian diet index. Multivariable Cox proportional hazard models were used to estimate hazard ratios (HRs) with 95% confidence intervals (CIs) for the predicted 10-year risk of CHD.
RESULTS
The study found that individuals in the highest hPDI quintile had a 19% lower risk score for CHD based on the Framingham Risk Score (model 3: HR, 0.80; 95% CI, 0.69 to 0.93; p for trend=0.010). In stratified analyses, the highest pro-vegetarian diet index was associated with a lower risk score for CHD in physically active individuals (HR, 0.74; 95% CI, 0.59 to 0.93; p for interaction=0.020). Conversely, the highest uPDI was associated with the highest risk score for CHD in those with a body mass index of ≥25 kg/m2 and a waist circumference ≥90 cm.
CONCLUSIONS
This prospective cohort study highlights the positive role of adhering to a high hPDI diet in the prevention of CHD in Korean men. Further prospective studies are needed to determine the association between various plant-based diet indices and the risk of CHD in Asian populations with different dietary habits.
Summary
Korean summary
본 연구는 한국 남성의 관상 동맥 심장 질환(CHD) 위험을 줄이는데 있어서 식이 패턴, 특히 건강한 식물성 식이 지수의 역할이 중요함을 강조한다. 높은 hPDI지수를 가진 사람이 CHD 위험이 유의미하게 19% 감소하는 것은 건강한 식물성 기반 식단 선택이 심혈관 건강에 미칠 수 있는 잠재된 영향력을 강조한다.
Key Message
The study highlights the important role of dietary patterns, especially healthy plant-based diet index (hPDI), in reducing the risk of coronary heart disease (CHD) among Korean men. A significant 19% reduction in CHD risk associated with the highest hPDI underscores the potential impact of dietary choices on cardiovascular health.

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  • Associations of Dietary Intake With Cardiovascular Diseases, Blood Pressure, and Lipid Profile in the Korean Population: An Updated Systematic Review and Meta-Analysis
    Jeongseon Kim, Madhawa Gunathilake, Tung Hoang, Oh Yoen Kim
    Journal of Lipid and Atherosclerosis.2026; 15(1): 111.     CrossRef
  • Associations between plant-based diets and cardiovascular disease, frailty, and cognitive dysfunction in middle and old age: a systematic review and meta-analysis of cohort studies
    Shipeng Zhang, Yanjie Jiang, Hanyu Wang, Qiqi Liu, Xingyi He, Moshen Pan, Yuecan Chen, Jiahui Xiong, Ze Chen, Pin Liu, Honglu Huang, Xiaocui Wang, Lu Wang, Junwen Tan, Caishan Fang, Qinwei Fu, Xinrong Li, Qinxiu Zhang, Yan Lu, Xueying Li
    Food & Function.2025; 16(10): 4061.     CrossRef
Decrease in household secondhand smoking among Korean adolescents associated with smoke-free policies: grade-period-cohort and interrupted time series analyses
Hana Kim, Heewon Kang, Sung-il Cho
Epidemiol Health. 2024;46:e2024009.   Published online December 13, 2023
DOI: https://doi.org/10.4178/epih.e2024009
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Smoke-free areas have expanded and related campaigns have been implemented since 1995 in Korea. As a result, household secondhand smoke (SHS) exposure has decreased over the past 15 years. We assessed the cohort effect, the effect of a 2008 campaign on household SHS exposure, and the impact of a complete smoking ban in public places along with increased penalties, as implemented in December 2011.
METHODS
Nationally representative cross-sectional 15-wave survey data of Korean adolescents were used. The 810,516 participants were classified into 6 grade groups, 15 period groups, and 20 middle school admission cohorts. An age-period-cohort analysis, conducted with the intrinsic estimator method, was used to assess the cohort effect of household SHS exposure, and interrupted-time series analyses were conducted to evaluate the effects of the smoke-free policy and the campaign.
RESULTS
For cohorts who entered middle school from 2002 to 2008, the risk of household SHS exposure decreased among both boys and girls. Immediately after implementation of the smoke-free policy, the prevalence of household SHS exposure by period decreased significantly for boys (coefficient, -8.96; p<0.05) and non-significantly for girls (coefficient, -6.99; p=0.07). After the campaign, there was a significant decrease in household SHS exposure by cohort among boys, both immediately and post-intervention (coefficient, -4.84; p=0.03; coefficient, -1.22; p=0.02, respectively).
CONCLUSIONS
A school-admission-cohort effect was found on household SHS exposure among adolescents, which was associated with the smoke-free policy and the campaign. Anti-smoking interventions should be implemented consistently and simultaneously.
Summary
Korean summary
지난 15년 동안 한국 청소년의 가정 내 간접흡연 노출은 감소했다. 가정 내 간접흡연 노출에 대하여 중학교 입학 코호트 효과가 존재하였다. 또한, 청소년의 가정 내 간접흡연 노출 감소는 2011년 12월 공공장소에서의 금연구역 규제와 2008년 시행된 캠페인과 연관되어 있었다.
Key Message
Household secondhand smoke (SHS) exposure among Korean adolescents has decreased over the past 15 years. There was a school admission cohort effect on household SHS exposure. A complete smoking ban in public space with increased penalties in December 2011 and a campaign in 2008 to avoid SHS exposure were associated with reduced household SHS exposure among adolescents.

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  • Effectiveness of tobacco control policy interventions on tobacco use behaviours and health outcomes based on ITS research methodology: a scoping review
    Ying Shi, Dan Qin, Haiyin Wang, Lihang Sun, Kaicheng Gu
    BMJ Open.2025; 15(11): e094148.     CrossRef
Special Article
Cancer risk based on alcohol consumption levels: a comprehensive systematic review and meta-analysis
Seunghee Jun, Hyunjin Park, Ui-Jeong Kim, Eun Jeong Choi, Hye Ah Lee, Bomi Park, Soon Young Lee, Sun Ha Jee, Hyesook Park
Epidemiol Health. 2023;45:e2023092.   Published online October 16, 2023
DOI: https://doi.org/10.4178/epih.e2023092
  • 65,535 View
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Alcohol consumption is a well-established risk factor for cancer. Despite extensive research into the relationship between alcohol consumption and cancer risk, the effect of light alcohol consumption on cancer risk remains a topic of debate. To contribute to this discourse, we conducted a comprehensive systematic review and meta-analysis.
METHODS
Our systematic review aimed to investigate the associations between different levels of alcohol consumption and the risk of several cancer types. We focused on analyzing prospective associations using data from 139 cohort studies. Among them, 106 studies were included in the meta-analysis after a quantitative synthesis.
RESULTS
Our analysis did not find a significant association between light alcohol consumption and all-cause cancer risk (relative risk, 1.02; 95% confidence interval, 0.99 to 1.04), but we observed a dose-response relationship. Light alcohol consumption was significantly associated with higher risks of esophageal, colorectal, and breast cancers. Light to moderate drinking was associated with elevated risks of esophageal, colorectal, laryngeal, and breast cancers. Heavy drinking was also found to contribute to the risk of stomach, liver, pancreas, and prostate cancers, thereby increasing the risk of almost all types of cancer. Additionally, females generally had lower cancer risks compared to males.
CONCLUSIONS
Our findings highlight that cancer risks extend beyond heavy alcohol consumption to include light alcohol consumption as well. These findings suggest that there is no safe level of alcohol consumption associated with cancer risk. Our results underscore the importance of public health interventions addressing alcohol consumption to mitigate cancer risks.
Summary
Korean summary
본 연구는 코호트 연구를 기반으로 하여 음주의 수준에 따른 암 위험 연관성에 대해 체계적 문헌고찰(139편)과 메타분석(106편)을 수행하였다. 연구 결과, 음주와 암 위험 사이에 용량-반응 관계가 나타났으며, 소량의 음주는 암 유형에 따라 차이가 있었으나, 식도암, 대장암, 전립선암(남성), 유방암(여성)에서 암 위험과의 연관성이 있음을 발견했다. 따라서, 암 위험 측면에서 음주에 안전한 수준이 없음을 시사하며, 음주와 관련된 잠재적 피해를 완화하기 위해서는 음주 지침 강화와 같은 공중보건개입이 필요하다.
Key Message
The aim of this study was to assess the relationship between different levels of alcohol consumption and the risk of various cancer types through a systematic review and meta-analysis, providing insights into the ongoing debate about alcohol consumption and cancer causality. The findings support a dose-response relationship between alcohol consumption levels and cancer risk and the light alcohol consumption was associated with risks of esophageal, colorectal, prostate (male), and breast (female) cancer. These results emphasize the absence of a safe threshold for alcohol consumption in terms of cancer risk.

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COVID-19: Cohort Profile
Cohort profile: investigating SARS-CoV-2 infection and the health and psychosocial impact of the COVID-19 pandemic in the Canadian CHILD Cohort
Rilwan Azeez, Larisa Lotoski, Aimée Dubeau, Natalie Rodriguez, Myrtha E. Reyna, Tyler Freitas, Stephanie Goguen, Maria Medeleanu, Geoffrey L. Winsor, Fiona S. L. Brinkman, Emily E. Cameron, Leslie Roos, Elinor Simons, Theo J. Moraes, Piush J. Mandhane, Stuart E. Turvey, Shelly Bolotin, Kim Wright, Deborah McNeil, David M. Patrick, Jared Bullard, Marc-André Langlois, Corey R. Arnold, Yannick Galipeau, Martin Pelchat, Natasha Doucas, Padmaja Subbarao, Meghan B. Azad
Epidemiol Health. 2023;45:e2023091.   Published online October 13, 2023
DOI: https://doi.org/10.4178/epih.e2023091
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
The coronavirus disease 2019 (COVID-19) pandemic has affected all Canadian families, with some impacted differently than others. Our study aims to: (1) determine the prevalence and transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection among Canadian families, (2) identify predictors of infection susceptibility and severity of SARS-CoV-2, and (3) identify health and psychosocial impacts of the COVID-19 pandemic. This study builds upon the CHILD Cohort Study, an ongoing multi-ethnic general population prospective cohort consisting of 3,454 Canadian families with children born in Vancouver, Edmonton, Manitoba, and Toronto between 2009 and 2012. During the pandemic, CHILD households were invited to participate in the CHILD COVID-19 Add-On Study involving: (1) brief biweekly surveys about COVID-19 symptoms and testing; (2) quarterly questionnaires assessing COVID-19 exposure and testing, vaccination status, physical and mental health, and pandemic-driven life changes; and (3) in-home biological sampling kits to collect blood and stool. In total, 1,462 households (5,378 participants) consented to the CHILD COVID-19 Add-On Study: 2,803 children (mean±standard deviation [SD], 9.0±2.7 years; range, 0-17 years) and 2,576 adults (mean±SD, 43.0±6.5 years; range, 18-85 years). We will leverage the wealth of pre-pandemic CHILD data to identify risk and resilience factors for susceptibility and severity to the direct and indirect pandemic effects. Our short-term findings will inform key stakeholders and knowledge users to shape current and future pandemic responses. Additionally, this study provides a unique resource to study the long-term impacts of the pandemic as the CHILD Cohort Study continues.
Summary
Key Message
· This study of 1,462 Canadian families (5,378 individuals) leverages a decade of extensive pre-pandemic CHILD Cohort Study data to identify risk and resilience factors for susceptibility to the direct and indirect effects of the COVID-19 pandemic. · Our short-term findings will inform key stakeholders and knowledge users to shape current and future pandemic responses. · This study provides a unique resource to study the long-term impacts of the pandemic as the CHILD Cohort Study continues.

Citations

Citations to this article as recorded by  
  • Predictors of SARS-CoV-2 anti-Spike IgG antibody levels following two COVID-19 vaccine doses among children and adults in the Canadian CHILD Cohort
    Rilwan Azeez, Spencer R. Ames, Larisa C. Lotoski, Geoffrey L. Winsor, Corey R. Arnold, Yannick Galipeau, Martin Pelchat, Stephanie Goguen, Elinor Simons, Theo J. Moraes, Piush J. Mandhane, Stuart E. Turvey, Shelly Bolotin, David M. Patrick, Jared Bullard,
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    Kozeta Miliku, Myrtha E Reyna, Maria Medeleanu, Ruixue Dai, Aimee Dubeau, Diana L Lefebvre, Kim Wright, Bassel Dawod, Marshall Beck, Elissa Brooks, Michael Kobor, Qingling Duan, Jeffrey R Brook, Wendy Lou, Fiona S L Brinkman, Geoffrey L Winsor, Justin Coo
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Original Article
Associations of cumulative average dietary total antioxidant capacity and intake of antioxidants with metabolic syndrome risk in Korean adults aged 40 years and older: a prospective cohort study (KoGES_CAVAS)
Ji-Sook Kong, Jiseon Lee, Youngjun Kim, Hye Won Woo, Min-Ho Shin, Sang Baek Koh, Hyeon Chang Kim, Yu-Mi Kim, Mi Kyung Kim
Epidemiol Health. 2023;45:e2023067.   Published online July 28, 2023
DOI: https://doi.org/10.4178/epih.e2023067
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Limited and inconsistent prospective evidence exists regarding the relationship of dietary total antioxidant capacity (dTAC) and antioxidant intake with metabolic syndrome (MetS) risk. We evaluated the associations of the cumulative averages of dTAC and antioxidant intake (in 5 classes: retinol, vitamin C, vitamin E, carotenoids, and flavonoids, as well as 7 flavonoid subclasses) with the risk of MetS.
METHODS
This study included 11,379 participants without MetS, drawn from the Korean Genome and Epidemiology Study_CArdioVascular disease Association Study (KoGES_CAVAS). The cumulative average consumption was calculated using repeated food frequency questionnaires. Incidence rate ratios were estimated using a modified Poisson regression model with a robust error estimator.
RESULTS
The median follow-up period was 5.16 years, and 2,416 cases of MetS were recorded over 58,750 person-years. In men, significant inverse associations were observed in all 5 antioxidant classes, except for the highest quartile of dTAC. In women, dTAC and total flavonoids were not significantly associated with MetS; however, significant L-shaped associations were found for the remaining 4 antioxidant classes. Of the 7 flavonoid subclasses, only flavones in the highest quartile for men and flavan-3-ols in women lacked significant associations with MetS. The inverse associations were not sex-specific, but they were particularly pronounced among participants with a body mass index (BMI) of 23 kg/m<sup>2</sup> or higher.
CONCLUSIONS
The findings suggest that most antioxidant classes and flavonoid subclasses, unlike dTAC, exhibit a clear beneficial association with MetS in an L-shaped pattern in both men and women, particularly those with a high BMI.
Summary
Korean summary
농촌코호트 조사 참여자를 대상으로 식이 총항산화능, 총항산화능 하위분류, 플라보노이드 하위분류와 대사증후군 발생 위험의 전향적 연관성을 평가한 결과, 대부분의 항산화물(5개항산화물 분류:4개 항산화 비타민과 플라보노이드; 플라보노이드 7개 하부분류)에서 대사증후군과 음의 상관성을 확인할 수 있었으며 총항산화능(남자와 여자)과 플라보노이드(여자)에서 약한 연관성을 보였다. 남녀간 유의한 상호작용은 없었고 특히 BMI가 높은 집단에서 두드러졌다. 이 연구의 결과는 특히 식이 총항산화능을 구성하는 하위 유형을 적절히 섭취하는 것이 특히 비만한 성인에서 대사증후군 위험을 낮추는 예방전략으로 효과가 있을 수 있음을 시사한다.
Key Message
We observed that the cumulative average of dietary antioxidant vitamins and most flavonoids may be have pivotal roles in prevention of MetS, although there may be weak associations of dTAC and flavonoids in women. Moreover, these inverse associations were more pronounced in high BMI individuals. Our results suggest that the consumption of antioxidants and flavonoid may mitigate the MetS risk, particularly in overweight/obese individuals at high risk of developing chronic diseases.

Citations

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  • The Relationship between Total Antioxidant Capacity and Metabolic Syndrome in the Perimenopausal Period
    妮妮 田
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  • Expansion of a food composition database for the food frequency questionnaire in the Korean Genome and Epidemiology Study (KoGES): a comprehensive database of dietary antioxidants and total antioxidant capacity
    Jiseon Lee, Ji-Sook Kong, Hye Won Woo, Mi Kyung Kim
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Cohort Profile
Integrated database-based Screening Cohort for Asian Nomadic descendants in China (Scan-China): Insights on prospective ethnicity-focused cancer screening
Yuelin Yu, Liying Qiao, Jing Han, Weiwei Wang, Weiwei Kang, Yunjing Zhang, Shu Shang, Ruogu Meng, Lin Zhuo, Siyan Zhan, Yunfeng Xi, Shengfeng Wang
Epidemiol Health. 2023;45:e2023048.   Published online April 18, 2023
DOI: https://doi.org/10.4178/epih.e2023048
  • 15,743 View
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
Established in 2017, the Screening Cohort for Asian Nomadic descendants in China (Scan-China) has benefited over 180,000 members of a multi-ethnic population, particularly individuals of Mongolian descent compared with the general population (Han ethnicity), in the Inner Mongolia Autonomous Region, China. This cohort study aims to evaluate the effectiveness of cancer screening and serve as a real-world data platform for cancer studies. The 6 most prevalent cancers in China are considered—namely, breast, lung, colorectal, gastric, liver and esophageal cancer. After baseline cancer risk assessments and screening tests, both active and passive follow-up (based on the healthcare insurance database, cancer registry, the front page of hospital medical records, and death certificates) will be conducted to trace participants’ onset and progression of cancers and other prevalent chronic diseases. Scan-China has preliminarily found a disproportionately lower screening participation rate and higher incidence/mortality rates of esophageal and breast cancer among the Mongolian population than among their Han counterparts. Further research will explore the cancer burden, natural history, treatment patterns, and risk factors of the target cancers.
Summary
Key Message
- Scan-China is the first and largest electronic health data (EHD)-integrated cancer screening program for the Mongolian ethnicity in Inner Mongolia. - Scan-China aims to evaluate the effectiveness of screening interventions, particularly on ethnic minorities, portray the natural history, explore risk factors and summarize treatment patterns and updated outcomes of prevalent tumors/other chronic diseases. - Scan-China database comprises baseline cancer risk assessment, screening tests results, active follow-up investigation for participants at high risk and EHD-integrated passive follow-up. Data sources for passive follow-up include healthcare insurance database, cancer registry, front page of hospital medical record and death certificates.

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  • Pronounced ethnic and sex disparities in gastric cancer burden and healthcare utilization in Inner Mongolia: a 9-year population-based cohort study 
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Original Articles
Association of group-level segregation with cardiovascular health in older adults: an analysis of data from the Korean Social Life, Health, and Aging Project
Sung-Ha Lee, Hyeok-Hee Lee, Kiho Sung, Yoosik Youm, Hyeon Chang Kim
Epidemiol Health. 2023;45:e2023041.   Published online April 4, 2023
DOI: https://doi.org/10.4178/epih.e2023041
  • 18,437 View
  • 216 Download
  • 1 Web of Science
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
The adverse health effects of individual-level social isolation (e.g., perceived loneliness) have been well documented in older adults. However, little is known about the impact of collective-level social isolation on health outcomes. We sought to examine the association of group-level segregation with cardiovascular health (CVH) in older adults.
METHODS
From the prospective Korean Social Life, Health, and Aging Project database, we identified 528 community-dwelling older adults who were aged ≥60 years or were married to those aged ≥60 years. Participants who belonged to smaller social groups separate from the major social group were defined as group-level-segregated. The CVH score was calculated as the number of ideal non-dietary CVH metrics (0-6), as modified from the American Heart Association’s Life’s Simple 7. Using ordinal logistic regression models, we assessed cross-sectional and longitudinal associations between group-level segregation and CVH.
RESULTS
Of the 528 participants (mean age, 71.7 years; 60.0% female), 108 (20.5%) were segregated at baseline. In the crosssectional analysis, group-level segregation was significantly associated with lower odds of having a higher CVH score at baseline after adjusting for socio-demographic factors and cognitive function (odds ratio [OR], 0.64; 95% confidence interval [CI], 0.43 to 0.95). Among 274 participants who completed an 8-year follow-up, group-level segregation at baseline was marginally associated with lower odds of having a higher CVH score at 8 years (OR, 0.49; 95% CI, 0.24 to 1.02).
CONCLUSIONS
Group-level segregation was associated with worse CVH. These findings imply that the social network structure of a community may influence its members’ health status.
Summary
Korean summary
본 연구는 “한국인의 사회적 삶, 건강과 노화에 대한 조사”(Korean Social Life, Health and Aging Project, KSHAP)에서 측정한 한 지역 내의 사회적 연결망 자료를 이용하여 사회적 분리와 심혈관 건강 사이의 관계를 살펴보았다. 그 결과, 사회적 분리는 비만, 고혈압, 콜레스테롤, 흡연, 음주 신체적 활동 등을 종합한 ‘라이프 심플 7’ 지표와 부정적인 관련성을 보였으며, 8년 후 추적 조사에서도 이 패턴이 유지되었다. 본 연구 결과는 사회적, 집단적 분리 현상이 신체적 건강에도 악영향을 초래할 수 있음을 시사한다.
Key Message
Using the prospective Korean Social Life, Health, and Aging Project (KSHAP) database, we discovered that group-level segregation was significantly associated with worse cardiovascular health (CVH). Also, we observed a tendency for baseline group-level segregation to be linked to worse CVH after an 8-year follow-up period. These findings emphasize the significance of group-level segregation as a potential contributing factor in the health outcomes of older adults.

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  • Association of social isolation and loneliness with the risk of hypertension in middle aged and older adults: Findings from a national representative longitudinal survey
    Shiqi Wang, Hao Zhang, Yiling Lou, Qiqi You, Qingqing Jiang, Shiyi Cao
    Journal of Affective Disorders.2024; 349: 577.     CrossRef
Impact of statin treatment on cardiovascular events in patients with retinal vein occlusion: a nested case-control study in Korea
Joonsang Yoo, Joo Youn Shin, Jimin Jeon, Jinkwon Kim
Epidemiol Health. 2023;45:e2023035.   Published online March 15, 2023
DOI: https://doi.org/10.4178/epih.e2023035
  • 19,770 View
  • 183 Download
  • 6 Web of Science
  • 7 Crossref
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Retinal vein occlusion (RVO) is associated with an increased risk of future cardiovascular events. Statin therapy is a key cornerstone in prevention for patients at high cardiovascular risk. However, little is known about the role of statin therapy for patients with RVO. This study evaluated whether statin treatment in patients with RVO was associated with a lower risk of cardiovascular events.
METHODS
A population-based, nested case-control study was conducted with a cohort of newly diagnosed RVO patients without prior cardiovascular disease between 2008 and 2020 using a nationwide health claims database in Korea. From this cohort of RVO patients, we identified cases of cardiovascular events (stroke or myocardial infarction) after RVO and matched controls based on sex, age, insurance type, antiplatelet use, and underlying comorbidities using 1:2 incidence density sampling.
RESULTS
Using a cohort of 142,759 patients with newly diagnosed RVO, we selected 6,810 cases and 13,620 matched controls. A significantly lower risk of cardiovascular events (adjusted odds ratio, 0.604; 95% confidence interval, 0.557 to 0.655) was observed in RVO patients with statin treatment than in those without statin treatment. Statin treatment was associated with a reduced risk for both stroke and myocardial infarction after RVO. Longer statin treatment after RVO was associated with a lower risk for cardiovascular events.
CONCLUSIONS
Statin treatment was associated with a lower risk for future cardiovascular events in patients with newly diagnosed RVO. Further studies are warranted to clarify the potential cardiovascular preventive role of statins in patients with RVO.
Summary
Korean summary
· 망막정맥폐색 환자들은 심뇌혈관질환의 발생 위험이 높다고 알려져 있다. · 이번 연구를 통해 망막정맥폐색의 발생 이후 스타틴을 복용한 환자들에서 심근경색 및 뇌졸중 발생 위험도가 감소함을 확인하였다. · 고위험군인 망막정맥폐색 환자들에서 적극적인 스타틴의 사용이 심뇌혈관질환의 예방에 도움이 될 수 있을 것이다.
Key Message
· Statin was associated with a lower risk of cardiovascular events in RVO patients. · The reduced risk was observed in both stroke and myocardial infarction after RVO. · Statins might be a good candidate for cardiovascular prevention in RVO patients.

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  • Artificial intelligence based retinal imaging for cardiovascular risk and statin guidance in retinal vein occlusion
    Dongjin Nam, Yong-Hwan Jang, So Jung Ryu, Sahil Thakur, Simon Nusinovici, Junseok Park, Moonsu Kim, Sunjin Hwang
    American Journal of Preventive Cardiology.2026; 26: 101427.     CrossRef
  • Retinal Imaging as a Window into Cardiovascular Health: Towards Harnessing Retinal Analytics for Precision Cardiovascular Medicine
    Jay Bharatsingh Bisen, Hayden Sikora, Anushree Aneja, Sanjiv J. Shah, Rukhsana G. Mirza
    Journal of Cardiovascular Development and Disease.2025; 12(6): 230.     CrossRef
  • Exploring the role of oxidative stress in retinal vein occlusion: an updated and comprehensive review on the pathophysiology and treatment perspectives
    Jiaqi Zhang, Xuejun Xie, Ya Mo
    International Ophthalmology.2025;[Epub]     CrossRef
  • Oclusión venosa de retina y su asociación con la enfermedad vascular aterosclerótica
    María Larrousse Morellón, Yéssica López Loureiro, Susana Ruiz Bilbao
    Medicina Clínica.2024; 163(4): 199.     CrossRef
  • Zerumbone Inhibits the Viability, Motility, and Angiogenesis of Human Retinal Microvascular Endothelial Cells (HRCECs) by Inhibiting Vascular Endothelial Growth Factor
    Jiexin Yu, Shule Jiang, Yanli Liu
    Current Eye Research.2024; 49(11): 1201.     CrossRef
  • Retinal venous occlusion and its association with atherosclerotic vascular disease
    María Larrousse Morellón, Yéssica López Loureiro, Susana Ruiz Bilbao
    Medicina Clínica (English Edition).2024; 163(4): 199.     CrossRef
  • Retinal Findings and Cardiovascular Risk: Prognostic Conditions, Novel Biomarkers, and Emerging Image Analysis Techniques
    Joseph Colcombe, Rusdeep Mundae, Alexis Kaiser, Jacques Bijon, Yasha Modi
    Journal of Personalized Medicine.2023; 13(11): 1564.     CrossRef
Clinical traits and systemic risks of familial diabetes mellitus according to age of onset and quantity: an analysis of data from the community-based KoGES cohort study
Ju-Yeun Lee, Kyungsik Kim, Sangjun Lee, Woo Ju An, Sue K. Park
Epidemiol Health. 2023;45:e2023029.   Published online February 23, 2023
DOI: https://doi.org/10.4178/epih.e2023029
  • 17,515 View
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  • 1 Web of Science
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
The aim of this study was to clarify the clinical trait of familial diabetes mellitus (DM) by analyzing participants’ risk of DM according to the age of DM onset in parents and siblings, and to evaluate individuals’ risk of DM-associated cardiometabolic diseases.
METHODS
Altogether, 211,173 participants aged ≥40 years from the Korean Genome and Epidemiology Study were included in this study. The participants were divided into groups based on the number (1 or 2 relatives) and age of onset (no DM and early, common, or late onset) of familial DM. Participants’ risk of DM was assessed using a Cox regression model with hazard ratios and 95% confidence intervals (CIs). A logistic regression model with odds ratios was used to evaluate associations among the participants’ likelihood of acquiring cardiometabolic diseases such as hypertension, chronic kidney disease (CKD), and cardiovascular disease.
RESULTS
The risk of developing DM was 2.02-fold (95% CI, 1.88 to 2.18) and 2.88-fold (95% CI, 2.50 to 3.33) higher, respectively, in participants with 1 and 2 family members diagnosed with familial DM. It was 2.72-fold (95% CI, 2.03 to 3.66) higher in those with early-onset familial DM. In the early-onset group, the respective risks of hypertension and CKD were 1.87-fold (95% CI, 1.37 to 2.55) and 4.31-fold (95% CI, 2.55 to 7.27) higher than in the control group.
CONCLUSIONS
The risk of DM and related cardiometabolic diseases was positively associated with the number of family members diagnosed with DM and an early diagnosis in family members with DM.
Summary
Korean summary
본 연구는 한국인유전체역학조사사업 역학자료를 이용하여, 당뇨병을 진단받은 가족 구성원 (부모 및 형제)의 수가 많고 당뇨병이 조기에 발생할수록 개인의 당뇨발생 위험도가 높아짐을 보고하였습니다. 또한 당뇨병이 조기에 발생한 가족구성원이 있을 경우 개인의 일부 심대사질환과의 연관성이 있을 수 있음을 설명하였습니다.
Key Message
This study demonstrated that the risk of diabetes in individuals was significantly associated with the quantity and the onset of family members diagnosed with diabetes. We also explained that having a family member with early-onset diabetes can be associated with some cardiometabolic diseases in individuals.

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  • Assessing blood sugar measures for predicting new-onset diabetes and cardiovascular disease in community-dwelling adults
    Jung-Hwan Kim, Yaeji Lee, Chung-Mo Nam, Yu-Jin Kwon, Ji-Won Lee
    Endocrine.2024; 86(2): 528.     CrossRef
Long working hours and the risk of hypothyroidism in healthy Korean workers: a cohort study
Yesung Lee, Woncheol Lee, Hyoung-Ryoul Kim
Epidemiol Health. 2022;44:e2022104.   Published online November 8, 2022
DOI: https://doi.org/10.4178/epih.e2022104
  • 19,044 View
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Long working hours have been reported to cause various health problems, but are currently practiced in many countries. Building upon a previous cross-sectional study, the authors aimed to elucidate the causal relationship between long working hours and hypothyroidism through a longitudinal study.
METHODS
Data were collected at baseline from 45,259 participants without thyroid disease and with consistent weekly working hours (36-40, 41-52, 53-60, and >60 hours) during the follow-up period. Hypothyroidism was defined using the reference limits of serum thyroid-stimulating hormone and free thyroxine levels. By estimating hazard ratios (HRs) and 95% confidence intervals (CIs) using Cox proportional hazards regression analysis, the risk of incident hypothyroidism was evaluated with 36-40 hours of work per week as the reference.
RESULTS
During 138,261.7 person-years of follow-up, 2,914 participants developed hypothyroidism (incidence density, 2.11/102 person-years). The multivariable-adjusted HRs of incident hypothyroidism for 41-52 hours, 53-60 hours, and >60 hours of work per week were 1.13 (95% CI, 1.03 to 1.24), 2.53 (95% CI, 2.17 to 2.95), and 2.57 (95% CI, 2.09 to 3.15), respectively. In dose-response analyses, long working hours had an approximately linear relationship with hypothyroidism incidence. The risk of incident hypothyroidism in those who worked 53-60 hours and >60 hours per week compared with the reference group was significantly higher among the older age group (≥36 years, stratified by median age), men, and daytime workers.
CONCLUSIONS
This large-scale cohort study demonstrated the association between long working hours and an increased risk of incident hypothyroidism with a dose-response relationship.
Summary
Korean summary
대규모 코호트연구를 통해 장시간노동을 수행한 노동자들에서 갑상선기능저하증의 위험이 높아지는 것을 확인할 수 있었다. 특히 연령, 성, 교대근무 유무에 따라 층화하여 분석한 결과에서 고연령, 남성, 교대근무를 하지 않는 노동자에서 관련성의 크기가 증가하였다.
Key Message
This large-scale cohort study (The Kangbuk Samsung Health Study), which used 45,259 participants without thyroid disease at baseline and estimated hazard ratios (HRs) using Cox proportional hazards regression analysis, demonstrated the association between long working hours and an increased risk of incident hypothyroidism with a dose-response relationship especially in older age group, men, and daytime workers.

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  • Effectiveness of Physical Activity-Led Workplace Health Promotion Interventions: A Systematic Review
    Shichao Zhang, Mingjian Nie, Jiale Peng, Hong Ren
    Healthcare.2025; 13(11): 1292.     CrossRef
  • Association between shift work and the risk of hypothyroidism in adult male workers in Korea: a cohort study
    Seonghyeon Kwon, Yesung Lee, Eunhye Seo, Daehoon Kim, Jaehong Lee, Youshik Jeong, Jihoon Kim, Jinsook Jeong, Woncheol Lee
    Annals of Occupational and Environmental Medicine.2023;[Epub]     CrossRef
Incidence of edentulism among older adults using the Korean National Health Insurance Service database, 2013-2018
Hyeonjeong Go, Eun-Kyong Kim, Hoi-In Jung, Song Vogue Ahn, Hosung Shin, Atsuo Amano, Youn-Hee Choi
Epidemiol Health. 2022;44:e2022091.   Published online October 17, 2022
DOI: https://doi.org/10.4178/epih.e2022091
  • 21,156 View
  • 282 Download
  • 7 Web of Science
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AbstractAbstract PDF
Abstract
OBJECTIVES
Population aging is rapidly accelerating worldwide. Oral diseases related to aging are also on the rise. This study examined trends in the incidence of edentulism among the older Korean population using data from the Korean National Health Insurance Service (KNHIS).
METHODS
Data on older adults, aged ≥75 years of age, were obtained from the KNHIS for the period 2013-2018. Edentulism was defined as a treatment history of complete dentures in the KNHIS database. The exclusion criteria consisted of both disease codes and treatment codes related to conservative dental treatment, including periodontal and extraction treatment afterward. Crude incidence rates (CIRs) and age-standardized incidence rates (AIRs) with 95% confidence intervals were calculated and reported per 100,000 person-years by the direct method. Trends were tested by Cochrane Armitage models.
RESULTS
Statistically significant increasing trends in both CIRs and AIRs were found among the older Korean population registered in the KNHIS (CIRs, 707.92 to 895.92; AIRs, 705.11 to 889.68; p<0.01). The incidence tended to increase in both genders (p<0.01). Both CIRs and AIRs in specific regions also showed slight but significant annual increases except for Jeju Island (p<0.01 or <0.05). The incidence showed increasing trends (p<0.01) in all income quintiles apart from the highest quintile. The edentulism incidence was highest in the lowest income group (the first quintile).
CONCLUSIONS
Our data showed that the incidence of edentulism among the elderly showed an increasing trend from 2013 to 2018. This result provides a basis for future epidemiological studies on the incidence of edentulism in the older Korean population.
Summary

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  • Awareness, Attitudes, Needs, and Demands Toward Tooth Replacement Options Among Patients at an Emirati University‐Setting Clinic
    Amaweya Alsammarraie, K. Sulafa El-Samarrai, Kelvin I. Afrashtehfar, Musab Saeed, Esraa Jaber, Berksam Amr Fatouh, Shahenda A. L. Sayed, Sara Khoshniyat, Wala Alkurdi, Mawada Abdelmagied, Boonlert Kukiattrakoon
    International Journal of Dentistry.2026;[Epub]     CrossRef
  • Evaluation of lateral and axial forces in atrophic maxilla with angled pterygoid implant using three dimensional finite element analysis
    Thair Mahroq, Ahmet Arslan, İbrahim Mutlu, Zakaria Al Joulaji
    Advances in Oral and Maxillofacial Surgery.2025; 18: 100545.     CrossRef
  • Epidemiologic features and economic burden of Wilson’s disease in South Korea: a nationwide analysis of the entire patient population
    Dong Eun Im, Hye-Young Kang
    Scientific Reports.2025;[Epub]     CrossRef
  • Clinical Performance and Longevity of Implant-Assisted Removable Partial Dentures Compared to Other Removable Prosthesis Types: A Systematic Review
    Robert-Cosmin Dinu, Cristian-Laurentiu Comanescu, Sergiu Drafta, Alexandru-Eugen Petre
    Dentistry Journal.2025; 13(9): 389.     CrossRef
  • Trend in the Incidence of Severe Partial Edentulism among Adults Using the Korean National Health Insurance Service Claim Data, 2014–2018
    Hyeonjeong Go, Hoi-In Jung, Song Vogue Ahn, Jeonghoon Ahn, Hosung Shin, Atsuo Amano, Youn-Hee Choi
    Yonsei Medical Journal.2024; 65(4): 234.     CrossRef
  • Decomposition Analysis of the Prevalence of Denture Use Between Rural and Urban Older Individuals With Edentulism in China: Cross-Sectional Study
    Lei Yuan, Yuan Yuan, Haotian Ren, Feng Zhang, Zhe Zhao, Qinqin Jiang, Zhenbang Wei, Jin-hai Sun
    Interactive Journal of Medical Research.2024; 13: e48778.     CrossRef
  • Estimated economic costs of dental implants among older South Korean adults, 2015–2018
    Hyeonjeong Go, Jeonghoon Ahn, Song Vogue Ahn, Hosung Shin, Atsuo Amano, Youn‐Hee Choi
    Clinical Oral Implants Research.2024; 35(12): 1560.     CrossRef
Type 2 diabetes mellitus increases the severity of non-fatal injuries, but not the risk of fatal injuries, among driver victims of motor vehicle crashes in Taiwan
I-Lin Hsu, Wen-Hsuan Hou, Ya-Hui Chang, Chung-Yi Li
Epidemiol Health. 2022;44:e2022076.   Published online September 16, 2022
DOI: https://doi.org/10.4178/epih.e2022076
  • 15,761 View
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Limited information is available on whether diabetes increases the severity of injuries from motor vehicle crashes (MVCs). This study aimed to investigate the association of type 2 diabetes with injury severity among driver victims of MVCs.
METHODS
This cohort study involved 75,737 adult driver victims with type 2 diabetes from Taiwan’s Police-Reported Traffic Accident Registry in 2015-2017, along with 150,911 sex-, age-, and calendar year-matched controls. The severity level of non- fatal injuries was derived from the International Classification of Diseases Programs for Injury Categorization based on the diagnostic codes of National Health Insurance claims within 3 days after an MVC. Information on fatal injuries within 3 days after an MVC was obtained from the Taiwan Death Registry. Logistic regression models were used to estimate the odds ratios (ORs) and the corresponding 95% confidence intervals (CIs) of injury severity in association with type 2 diabetes.
RESULTS
After adjusting for potential confounders, driver victims with type 2 diabetes experienced significantly higher risks of mild and severe non-fatal injuries than their counterparts without diabetes, with covariate-adjusted ORs of 1.08 (95% CI, 1.05 to 1.11) and 1.28 (95% CI, 1.20 to 1.37), respectively. By contrast, the adjusted OR for fatal injuries was not significantly elevated, at 1.02 (95% CI, 0.89 to 1.18). Similar results were found when car and scooter driver victims were analyzed separately.
CONCLUSIONS
Type 2 diabetes was found to moderately increase the severity of non-fatal injuries from MVCs among car and scooter driver victims.
Summary
Key Message
With 75,737 driver victims with diabetes and 150,911 matched controls, this study showed an 8% and 28% increase in mild and severe non-fatal injury, respectively among driver victims with diabetes. Such increase in risk was equally applied to both car and scooter drivers. No increase in risk of 3-day mortality after crash was found.

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  • Prevalence of diabetes mellitus among traumatic patients admitted to Aseer Central Hospital, Aseer Region, Abha, Saudi Arabia: cross-sectional study
    Majed Mohammed Al Saleh, Bandar A. Alasmari, Ali Mohammed AlAmri, Mohammed Mabkhoot Mogbel, Ali Saeed Alasmary, Alhussein Ali Almonawar, Saeed Doos S. Almontashri, Hassan Mussa Al Mojamad, Turki Abdullah Al Qahtani, Abdulrahman Mohammed Alshehri, Ibrahim
    BMC Endocrine Disorders.2025;[Epub]     CrossRef
  • A population-based study on meteorological conditions in association with motor vehicle collisions among people with type 2 diabetes
    Chung-Yi Li, Ya-Hui Chang, Hon-Ping Ma, Ping-Ling Chen, Chang-Ta Chiu, I-Lin Hsu
    Environmental Health and Preventive Medicine.2025; 30: 91.     CrossRef
Systematic Review
The relationship between metabolic syndrome and its components with bladder cancer: a systematic review and meta-analysis of cohort studies
Mozhgan Ahmadinezhad, Maedeh Arshadi, Elahe Hesari, Maedeh Sharafoddin, Hosein Azizi, Farzad Khodamoradi
Epidemiol Health. 2022;44:e2022050.   Published online May 30, 2022
DOI: https://doi.org/10.4178/epih.e2022050
  • 25,389 View
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  • 19 Web of Science
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
A previous meta-analysis, entitled “The association between metabolic syndrome and bladder cancer susceptibility and prognosis: an updated comprehensive evidence synthesis of 95 observational studies involving 97,795,299 subjects,” focused on all observational studies, whereas in the present meta-analysis, we focused on cohort studies to obtain more accurate and stronger evidence to evaluate the association between metabolic syndrome and its components with bladder cancer. PubMed, Embase, Scopus, and Web of Science were searched to identify studies on the association between metabolic syndrome and its components with bladder cancer from January 1, 2000 through May 23, 2021. The pooled relative risk (RR) and 95% confidence intervals (CI) were used to measure this relationship using a random-effects meta-analytic model. Quality appraisal was undertaken using the Newcastle-Ottawa Scale. In total, 56 studies were included. A statistically significant relationship was found between metabolic syndrome and bladder cancer 1.09 (95% CI, 1.02 to 1.17), and there was evidence of moderate heterogeneity among these studies. Our findings also indicated statistically significant relationships between diabetes (RR, 1.23; 95% CI, 1.16 to 1.31) and hypertension (RR, 1.07; 95% CI, 1.01 to 1.13) with bladder cancer, but obesity and overweight did not present a statistically significant relationship with bladder cancer. We found no evidence of publication bias. Our analysis demonstrated statistically significant relationships between metabolic syndrome and the risk of bladder cancer. Furthermore, diabetes and hypertension were associated with the risk of bladder cancer.
Summary
Key Message
In this meta-analysis study, an attempt was made to investigate the relationship between metabolic syndrome and its components with bladder cancer, and as a result of this study, the relationship between metabolic syndrome and its components such as diabetes, high blood pressure, and bladder cancer was observed. Metabolic syndrome is more common among middle-aged and elderly people, and the elderly population is increasing worldwide, so the prevalence of this disease shortly may affect the healthcare system. Therefore, with correct health policies in all societies, the exorbitant costs that this disease brings can be avoided.

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    Desheng Zhang, Junwei Ren, Junjiang Ye, Ruicheng Wu, Jie Wang, Dengxiong Li, Yunjin Bai, Ping Han
    International Journal of Surgery.2026; 112(1): 1479.     CrossRef
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    Abdulaziz Bakhsh, Sulaiman Abdullah, Diaa Mohammed Farghal, Ahmad Salim Badawi, Emad Rajih, Mansour Alnazari
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  • The Insulin–Urothelial Axis: Evaluating Insulin Resistance as a Convergent Driver of Bladder Cancer Across Diverse Risk Factor Profiles
    Giovanni Tarantino, Vincenzo Citro, Ciro Imbimbo, Felice Crocetto
    International Journal of Molecular Sciences.2026; 27(9): 3919.     CrossRef
  • Risk of bladder cancer in patients with type 2 diabetes mellitus: a retrospective population-based cohort study in Lithuania
    Adomas Ladukas, Ausvydas Patasius, Marius Kincius, Mingaile Drevinskaite, Justinas Jonusas, Donata Linkeviciute-Ulinskiene, Lina Zabuliene, Giedre Smailyte
    Cancer Causes & Control.2025; 36(1): 21.     CrossRef
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    Fernando Bril, Alicia Elbert
    Metabolism.2025; 162: 156066.     CrossRef
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    Lin Zhou, Huiyu Gao, Jiabin Zhang, Qian Xu, Qiang Wang, Li Wang, Ying Tan, Ziyuan Luo, Junjie Zhou, Hui Shuai, Xiang Cai, Yongbo Zheng, Shan Wang, Xi Duan, Tao Wu
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Original Article
The association between fruit and vegetable consumption and metabolic syndrome in Korean adults: does multivitamin use matter?
Jihae Kim, Li-Juan Tan, Hyein Jung, Yumi Roh, Kyungjoon Lim, Sangah Shin
Epidemiol Health. 2022;44:e2022039.   Published online April 19, 2022
DOI: https://doi.org/10.4178/epih.e2022039
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Metabolic syndrome (MetS) is closely associated with dietary intake; however, few studies have investigated whether the consumption of fruits and vegetables and multivitamin use affect MetS in the Korean population. This study aimed to examine these effects in Korean adults.
METHODS
This was a cross-sectional study of 89,548 participants aged between 40 years and 69 years selected from the baseline data of the Health Examinees study conducted in Korea. Fresh vegetable and fruit consumption was assessed using a validated 106-item food frequency questionnaire. MetS and its components were defined using the National Cholesterol Education Program, Adult Treatment Panel III criteria. Multivariate logistic regression analyses were conducted to identify associations of fresh vegetable, fruit, and fresh vegetable+fruit consumption and multivitamin use with the prevalence of MetS.
RESULTS
Female in the highest quartile of fresh vegetable, fruit, and fresh vegetable + fruit consumption exhibited a lower prevalence of MetS than those in the lowest quartile. An inverse association with the prevalence of MetS was observed among male with only fresh vegetable consumption. The interaction between the 3 categories and multivitamin intake on the prevalence of MetS was not significant (all p<sub>interaction</sub>>0.05), regardless of sex.
CONCLUSIONS
Multivitamin use and consumption of fresh vegetables and fruits had no significant synergistic effects. Although fresh vegetable and fruit consumption showed an inverse association with the prevalence of MetS, this relationship was not altered by multivitamin use.
Summary
Korean summary
본 연구는 한국인 유전체역학조사사업의 도시코호트 조사에 참여한 40-69세 한국 성인 89 548명의 과일과 채소의 섭취와 종합비타민 섭취가 대사증후군에 미치는 영향을 분석하였다. 본 연구에서는 매일 다양한 과일과 채소를 섭취하면, 종합비타민의 섭취와 상관없이 대사증후군 유병 위험도를 낮추는 것을 확인하였다. 따라서, 대사증후군 예방을 위해서는 일상적인 식사에서 충분한 과일과 채소를 섭취하는 것이 권장된다.
Key Message
This study aimed to examine whether the consumption of fruits and vegetables and multivitamin use affect MetS among Korean middle-aged adults. Data was from the Health Examinees Study among 89 548 subjects. Results suggested that fruits and vegetables consumption was related with a decreased prevalence of MetS. However, there was no significant synergistic effect between the consumption of fruits and vegetables and multivitamin use in further reducing MetS prevalence.

Citations

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  • Associations of Dietary Intake With Cardiovascular Diseases, Blood Pressure, and Lipid Profile in the Korean Population: An Updated Systematic Review and Meta-Analysis
    Jeongseon Kim, Madhawa Gunathilake, Tung Hoang, Oh Yoen Kim
    Journal of Lipid and Atherosclerosis.2026; 15(1): 111.     CrossRef
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Cohort Profile
The Asenze Cohort Study in KwaZulu-Natal, South Africa: protocol and cohort profile
Chris Desmond, Gabriella A. Norwitz, Jane D. Kvalsvig, Rachel S. Gruver, Shuaib Kauchali, Kathryn G. Watt, Nonhlanhla P. Myeza, Adele Munsami, Leslie L. Davidson
Epidemiol Health. 2022;44:e2022037.   Published online April 5, 2022
DOI: https://doi.org/10.4178/epih.e2022037
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  • 6 Web of Science
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AbstractAbstract AbstractSummary PDF
Abstract
The Asenze cohort is set in South Africa, a middle-income country impacted by one of the highest global rates of people living with HIV/AIDS and high levels of socioeconomic inequality. This longitudinal population-based cohort of children and their primary caregivers assesses household and caregiver functioning, child health, social well-being, and neuro-development from childhood through adolescence. Almost 1,600 children born at the peak of the human immunodeficiency virus epidemic (2003-2005) were followed (with their primary caregivers) in 3 waves, between 2008 and 2021, at average ages of 5, 7, and 16. Wave 3 is currently underway, having assessed over 1,100 of the original wave 1 children. Wave 4 begins in 2022. The study, with a dyadic structure, uses a broad range of measures, validated in South Africa or recommended for global use, that address physical, social and neuro-development in childhood and adolescence, and the social, health, and psychological status of children’s primary caregivers. The Asenze study deepens our understanding of childhood physical, cognitive, and social abilities and/or disabilities, including risk-taking behaviors, and biological, environmental, and social determinants of health. We anticipate the findings will contribute to the development of community-informed interventions to promote well-being in this South African population and elsewhere.
Summary
Key Message
The Asenze Cohort Study, one of a limited number of population-based studies set in low- and middle-income countries, with a high level of retention, provides an understanding of neuro-developmental, psychosocial, home environmental and economic exposures and outcomes of over 1100 adolescents and their primary caregivers in KwaZulu-Natal, South Africa.

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  • Caregiver mental, behavioral, and social health during the COVID-19 pandemic in South Africa: results from the Asenze cohort study
    Lina Y. Demis, Chris Desmond, Rachel S. Gruver, Furzana Timol, Leslie L. Davidson, Jeremy C. Kane
    Social Psychiatry and Psychiatric Epidemiology.2026; 61(1): 181.     CrossRef
  • Determinants of school dropout in the Asenze cohort study in KwaZulu-Natal, South Africa
    Gavin George, Furzana Timol, Chris Desmond, Jeremy Kane, Leslie L. Davidson
    Vulnerable Children and Youth Studies.2026; 21(1): 1.     CrossRef
  • Early transition markers, opportunities, and limitations that define pathways into the labour market from adolescence to adulthood in South Africa
    Laura Rossouw, Kathryn Grace Watt, Furzana Timol, Leslie L. Davidson, Chris Desmond
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    Roisin E. Drysdale, Sanele Mvelase, Jeremy Kane, Rachel S. Gruver, Chris Desmond, Leslie L. Davidson
    Journal of Adolescent Health.2025; 76(4): 638.     CrossRef
  • Intimate Partner Violence and Determinants of HIV Seroconversion among Female Caregivers in Kwazulu-Natal, South Africa: Insights from the Asenze Longitudinal Study
    Christopher M. Ferraris, Rachel S. Gruver, Gavin George, Leslie L. Davidson, Chris Desmond, Anthony F. Santoro, Sahba Besharati, Justin Knox
    AIDS and Behavior.2025; 29(8): 2349.     CrossRef
  • The social determinants of adolescent anxiety and depression in peri-urban South Africa
    Laura Rossouw, Kathryn Watt, Leslie L. Davidson, Chris Desmond, Karli Montague-Cardoso
    PLOS Mental Health.2024; 1(6): e0000173.     CrossRef
  • The impact of caregiver mental health on child prosocial behavior: A longitudinal analysis of children and caregivers in KwaZulu-Natal, South Africa
    Gabriella A. Norwitz, Chris Desmond, Rachel S. Gruver, Jane D. Kvalsvig, Amaleah F. Mirti, Shuaib Kauchali, Leslie L. Davidson, Giulia Ballarotto
    PLOS ONE.2023; 18(10): e0290788.     CrossRef
Original Articles
Dairy product consumption and type 2 diabetes among Korean adults: a prospective cohort study based on the Health Examinees (HEXA) study
Jiaqi Zhang, Kyungjoon Lim, Sangah Shin
Epidemiol Health. 2022;44:e2022019.   Published online February 4, 2022
DOI: https://doi.org/10.4178/epih.e2022019
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
It has been suggested that the consumption of dairy products helps lower the prevalence of type 2 diabetes (T2D). We investigated the association between the consumption of dairy products and T2D events in middle-aged Korean adults.
METHODS
We followed up 53,288 participants (16,895 male and 36,393 female) in the Health Examinees (HEXA) study. The consumption of dairy products was assessed using the self-administered food frequency questionnaire, and T2D was defined according to the 2015 treatment guidelines of the Korean Diabetes Association. Hazard ratios (HRs) and 95% confidence intervals (CIs) between the consumption of dairy products and the risk of T2D were calculated using Cox proportional hazards models after adjusting for potential confounders. Spline regression was used to better represent the association between the consumption of dairy products and the risk of T2D.
RESULTS
Among male, those with higher consumption of dairy products had a significantly lower risk of T2D than those who consumed essentially no dairy products (HR, 0.73; 95% CI, 0.58 to 0.91). In particular, consumption of yogurt (HR, 0.75; 95% CI, 0.60 to 0.93; p<sub>trend</sub>=0.035) and cheese (HR, 0.66; 95% CI, 0.49 to 0.89; p<sub>trend</sub>=0.005) was negatively associated with the incidence of T2D in male. In female, daily consumption of 1 serving of yogurt decreased the risk of T2D by 11%.
CONCLUSIONS
The association between the consumption of dairy products and the risk of T2D differed by sex and dairy product type. Further prospective studies are needed to confirm these associations.
Summary
Korean summary
본 연구는 한국인유전체역학조사사업의 도시코호트 기반조사와 추적조사에 참여한 40-69세 한국 성인 53 288명의 유제품 섭취와 제2형 당뇨병 발생 위험도를 분석하였다. 요거트와 치즈를 포함한 유제품 섭취가 많을수록 남성의 제2형 당뇨병 위험도가 낮아졌다. 요거트 섭취량을 하루에 한번 증가하면 여성의 제2형 당뇨병 위험도가 감소하다. 유제품 소비와 제2형 당뇨병의 위험도의 연관성은 성별과 유제품에 따라 다르다. 이를 확인하기 위해서는 추가 연구가 필요하다.
Key Message
The study aimed to assess the association between the consumption of dairy products and type 2 diabetes events in Korean adults. Data was from the Health Examinees Study among 53 288 participants. Higher consumption of dairy products including yogurt and cheese was associated with a lower risk of developing type 2 diabetes in men. Increasing yogurt intake by one serving/day reduces the risk of type 2 diabetes in women. The association between the consumption of dairy products and the risk of type 2 diabetes differed by gender and dairy product type. Further studies are needed to confirm this.

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  • Dairy Intake and Type 2 Diabetes Mellitus in Iranian Older Adults: Insights From the Baseline Phase of the Birjand Longitudinal Aging Study
    Mahboubeh Darabi, Amirmohammad Tajik, Mehraneh Movahedi Aliabadi, Zeinab Shakeri, Maryam Mohammadi, Hossein Fakhrzadeh, Mitra Moudi, Masoumeh Khorashadizadeh, Mehdi Varmaghani, Farshad Sharifi
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    Miguel Freitas, Annalouise O’Connor, Amanda Blechman, Christopher J Cifelli, Wendy Reinhardt Kapsak
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    Zahra Bahadoran, Parvin Mirmiran, Fereidoun Azizi
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    Viswanathan Mohan, Kuzhandhaivelu Abirami, Valangaiman Sriram Manasa, Anandakumar Amutha, Balaji Bhavadharini, Rinky Rajput, Nagarajan Lakshmipriya, Chowdary Sruthi, Ranjit Mohan Anjana, Ranjit Unnikrishnan, Vasudevan Sudha, Kamala Krishnaswamy
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Independent predictors of depressive symptoms and social isolation on 2-year all-cause mortality among the Korean elderly in a population-based cohort study: gender differences
Hyunsuk Jeong, Hyeon Woo Yim, Beom-Woo Nam
Epidemiol Health. 2022;44:e2022012.   Published online January 8, 2022
DOI: https://doi.org/10.4178/epih.e2022012
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
This study examined whether depressive symptoms and social isolation were independent predictors of 2-year all-cause mortality among the elderly using data from a population-based cohort study.
METHODS
In total, 1,033 participants (320 men and 713 women) older than 60 years of age participated in this study. Depressive symptoms, social isolation status, and socio-demographic and health-related covariates were assessed at baseline. The primary outcome measure was 2-year all-cause mortality. Data were collected through in-person interviews by trained interviewers. The GENMOD procedure was used to calculate relative risks (RRs).
RESULTS
Of the 1,033 participants, 102 (40 men and 62 women) died within the follow-up period of 2 years. During the 2-year follow-up period, 17.8% of depressed men and 12.3% of depressed women died, and 29.8% of socially isolated men and 14.9% of socially isolated women died. Social isolation was an independent predictor of mortality in elderly men (adjusted relative risk [aRR], 4.6, 95% confidence interval [CI], 2.0 to 10.2), while depressive symptoms were an independent predictor of mortality in elderly women (aRR, 2.0; 95% CI, 1.2 to 3.6) when controlling for potential confounding factors. However, the depressive symptoms detected using the geriatric depression scale were not associated with mortality in men, and social isolation was not associated with mortality in women.
CONCLUSIONS
The effects of depressive symptoms and social isolation on 2-year all-cause mortality within an elderly population differed according to gender. Gender-specific community-based interventions must be developed to potentially reduce 2-year all-cause mortality among the elderly.
Summary
Korean summary
본 연구는 지역사회 거주하는 저소득층 노인을 대상으로 한 코호트 연구로 2년 추적조사를 수행하여 사망 원인의 예측인자를 분석하였다. 남성노인에서는 사회적 고립이, 여성노인에서는 우울증상이 2년 모든 사망원인의 독립적인 예측인자였다. 노인의 사망율을 줄이기 위한 지역사회 개입 프로그램은 남성에게는 사회적 고립을 해소를, 여성에게는 우울증상 개선을 위한 프로그램이 요구된다.
Key Message
The effects of depressive symptoms and so¬cial isolation on 2-year all-cause mortality among the elderly dif¬fered according to gender. For elderly men, social isolation increased the risk of 2-year all-cause mortality by 4.6 times compared to those who were not socially isolated. However, the depressive symptoms identified by the GDS-15 were not associated with 2-year all-cause mortality in men. From a public health perspective, these findings suggest that gender-specific community-based interventions are needed to mitigate all-cause mortality among the elderly.

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Cohort Profiles
The Dehgolan Prospective Cohort Study (DehPCS) on non-communicable diseases in a Kurdish community in the west of Iran
Farhad Moradpour, Ebrahim Ghaderi, Ghobad Moradi, Mojdeh Zarei, Amjad Mohamadi Bolbanabad, Bakhtiar Piroozi, Azad Shokri
Epidemiol Health. 2021;43:e2021075.   Published online October 1, 2021
DOI: https://doi.org/10.4178/epih.e2021075
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AbstractAbstract AbstractSummary PDF
Abstract
The Dehgolan Prospective Cohort Study (DehPCS) was conducted to examine and identify risk factors for the most prevalent non-communicable diseases (NCDs). In addition, in order to examine participants’ health status, socioeconomic status, behavioral factors, nutritional status, and environmental exposures, the DehPCS collected, analyzed, and stored blood, urine, nail, and hair samples to conduct genetic studies and identify biomarkers and other biological determinants of NCDs. In total, 3,996 adults aged 35 to 70 from the general population participated in the study from February 2018 to March 2019. Of them, 43.7% were women. The first follow-up wave was conducted with 3,995 participants. Information on a wide range of variables was collected, including on socioeconomic status, lifestyle, nutritional status, habits, physical examination findings, medication use, and medical history. Proxy variables such as body mass index, metabolic equivalent task score, wealth index, and macronutrients and micronutrients were calculated. The most common self-reported diseases in descending order were kidney stones, hypertension, and fatty liver. The prevalence of diabetes and hypertension was 9.3% and 33.4%, respectively. All data, samples, and measurements will be collected again at 5-year intervals. Thus, it will be possible to examine time-dependent changes in the risk factors of NCDs. The DehPCS can be used to study the relationships among genetics, lifestyle, socioeconomic status, and environmental risk factors and the most prevalent NCDs in case-cohort studies using a nested case-control design that will be applied to the cohort infrastructure. Researchers can also submit pre-proposals via the following web address: http://c.ddrc.ac.ir/persianaccess/Account/Login.
Summary
Key Message
• The DehPCS was designed to examine NCDs among the Kurdish population, who are located in a wide area between the northwest of the Zagros Mountains and the eastern Taurus Mountains covering Turkey, Iraq, Iran, and Syria. • In total, 3,996 adults aged 35 to 70 from the general population participated in the study. • All data, samples, and measurements from the registration phase will be collected again at 5-, 10-, and 15-year intervals. • After labeling, aliquots were placed in a freezer at -70°C to enable ongoing studies of the samples in the future.

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    Maziar Afshar, Maryam Afraie, Mobin Azami, Kamran Zamani, Farhad Moradpour, Yousef Moradi
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    Mohammed Alhakamy, Ismaeel AlShoaibi, Basheer Abdo, Mohammed Abdullah, Khaled Alzanen, Nabil Albadani, Faisal Ahmed, Khalil Al-Naggar, Nabil Aljuma’ai, Ibrahim Alnadhari, Abdulghani Al-Hagri, Fadhl Alareefi
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    Zahra Ghanbari, Yousef Moradi, Negin samiee, Farhad Moradpour
    BMC Oral Health.2024;[Epub]     CrossRef
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    Negar Piri, Yousef Moradi, Reza Ghanei Gheshlagh, Mahsa Abdullahi, Eghbal Fattahi, Farhad Moradpour
    The Journal of Clinical Hypertension.2023; 25(2): 146.     CrossRef
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    Dana Vaisi, Farhad Moradpour, Shadieh Mohammadi, Daem Roshani, Yousef Moradi
    The Clinical Respiratory Journal.2023; 17(6): 589.     CrossRef
  • Prevalence of metabolic syndrome and its association with oral health: First results from the Kurdish cohort study
    Farhad Moradpour, Zahra Karimi, Zeinab Fatemi, Yousef Moradi, Mohammad Rastegar Khosravi, Azad Shokri, Mohammad Karimzadeh
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  • Socioeconomic inequalities in metabolic syndrome and its components in a sample of Iranian Kurdish adults
    Pardis Mohammadzadeh, Farhad Moradpour, Bijan Nouri, Farideh Mostafavi, Farid Najafi, Ghobad Moradi
    Epidemiology and Health.2023; 45: e2023083.     CrossRef
  • Socio-demographic correlates of diabetes self-reporting validity: a study on the adult Kurdish population
    Farhad Moradpour, Negar Piri, Hojat Dehghanbanadaki, Ghobad Moradi, Mahdiyeh Fotouk-Kiai, Yousef Moradi
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Cohort profile: the Environmental-Pollution-Induced Neurological EFfects (EPINEF) study: a multicenter cohort study of Korean adults
Heeseon Jang, Woojin Kim, Jaelim Cho, Jungwoo Sohn, Juhwan Noh, Gayoung Seo, Seung-Koo Lee, Young Noh, Sung Soo Oh, Sang-Baek Koh, Hee Jin Kim, Sang Won Seo, Ho Hyun Kim, Jung Il Lee, Sun-Young Kim, Changsoo Kim
Epidemiol Health. 2021;43:e2021067.   Published online September 16, 2021
DOI: https://doi.org/10.4178/epih.e2021067
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  • 11 Web of Science
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
The general population is exposed to numerous environmental pollutants, and it remains unclear which pollutants affect the brain, accelerating brain aging and increasing the risk of dementia. The Environmental-Pollution-Induced Neurological Effects study is a multi-city prospective cohort study aiming to comprehensively investigate the effect of different environmental pollutants on brain structures, neuropsychological function, and the development of dementia in adults. The baseline data of 3,775 healthy elderly people were collected from August 2014 to March 2018. The eligibility criteria were age ≥50 years and no self-reported history of dementia, movement disorders, or stroke. The assessment included demographics and anthropometrics, laboratory test results, and individual levels of exposure to air pollution. A neuroimaging sub-cohort was also recruited with 1,022 participants during the same period, and brain magnetic resonance imaging and neuropsychological tests were conducted. The first follow-up environmental pollutant measurements will start in 2022 and the follow-up for the sub-cohort will be conducted every 3-4 years. We have found that subtle structural changes in the brain may be induced by exposure to airborne pollutants such as particulate matter 10 μm or less in diameter (PM<sub>10</sub>), particulate matter 2.5 μm or less in diameter (PM<sub>2.5</sub>) and Mn<sub>10</sub>, manganese in PM<sub>10</sub>; Mn<sub>2.5</sub>, manganese in PM<sub>2.5</sub>. PM<sub>10</sub>, PM<sub>2.5</sub>, and nitrogen dioxide in healthy adults. This study provides a basis for research involving large-scale, long-term neuroimaging assessments in community-based populations.
Summary
Korean summary
EPINEF 코호트는 환경유해인자에 의한 신경계 질환의 위해성을 평가하고, 환경유해인자로 유발되는 신경심리학적 기능 저하 또는 뇌 노화에 대한 근거를 제공하기 위해 2014년부터 50세 이상의 건강한 성인을 대상으로 시작되었습니다. 본 코호트는 뇌 영상학적 표지자와 인지 기능과 관련된 환경유해인자를 광범위하게 조사한 한국 최초의 장기 추적관찰 연구로, 대기 오염 물질 또는 다환방향족탄화수소 노출이 대뇌 영상표지자 및 신경심리학적 기능, 노인의 우울 증상에 대한 악화 요인으로서의 대기오염물질 노출과 결혼 상태의 교호작용 등의 연구결과들을 발표하였습니다. 또한, 추후에도 코호트의 지속적인 추적을 통해 환경유해인자 노출에 따른 신경학적 건강영향을 연구하여, 신경계 질환 관리를 위한 보건 정책 개선에 기여할 수 있을 것으로 기대됩니다.
Key Message
The EPINEF cohort was started in 2014 to assess the risk of neurological diseases caused by environmental harmful factors and to provide evidence for neuropsychological dysfunction or brain aging induced by these factors. This cohort is the first long-term follow-up study in Korea to extensively investigate brain imaging markers and environmental harmful factors related to cognitive function, and several related research results have been published. In addition, the follow-up survey will be continued in the future, and we expect that the results of the study will contribute to improving health policies for the management of neurological diseases.

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    You Hyun Park, YeonJae Park, Yongjin Lee, Jaelim Cho, Dae Ryong Kang
    Environmental Research.2026; 291: 123522.     CrossRef
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Original Article
Recent increase in pertussis incidence in Korea: an age-period-cohort analysis
Chanhee Kim, Seonju Yi, Sung-il Cho
Epidemiol Health. 2021;43:e2021053.   Published online August 18, 2021
DOI: https://doi.org/10.4178/epih.e2021053
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Pertussis or whooping cough—one of the most contagious diseases—is caused by the Gram-negative bacterium <i>Bordetella pertussis</i>. Despite a high vaccination rate, Korea recently experienced a resurgence of pertussis. This study explores patterns and possible explanations for this resurgence through an age-period-cohort analysis.
METHODS
Using secondary data from the infectious disease portal of the Korea Disease Control and Prevention Agency and the Korea Statistical Information Service of Statistics Korea, this study analyzed the incidence of pertussis in Korea to determine which factors contributed to the recent increase using an age-period-cohort model.
RESULTS
Analysis of the age effect indicated that the age group most vulnerable to pertussis was 0-year to 2-year-olds. Analysis of the period effect showed a sharp increase in the incidence rate after 2016. Analysis of the cohort effect showed a significant decrease in incidence beginning with the 1955 birth cohort, with the risk increasing again with the 2000s birth cohort.
CONCLUSIONS
Previous studies have suggested 3 main possible explanations for our results. First, the increased incidence rate can be attributed to contact rates. Second, the rate of immunity through natural exposure has decreased due to the low number of circulating pathogens, in turn affecting the trend of infection. Lastly, variations in pathogens may have also contributed to the increase in incidence. Given that the most significant increase in incidence was observed among infants younger than 1 year old, sufficient maternal immunity must be prioritized to provide passive immunity to newborns via the placenta.
Summary
Korean summary
본 연구는 연령-기간-코호트 모델을 활용하여 예방접종률이 높은 국가들의 백일해 재출현에 기여하는 요인에 무엇이 있는지 살펴보았다. 연령에 따른 사회적 접촉률(contact rate)의 변화, 자연노출에 의한 면역 강화(natural boosting) 기회의 감소, 그리고 백일해 병원체의 변이가 백일해 재출현의 원인일 수 있다. 분석 결과 영아 집단에서 백일해 발병률이 가장 급격한 증가가 관찰되었으며, 이는 모성면역의 확보가 중요하다는 점을 시사한다.
Key Message
This study examined factors contribute to the re-emergence of pertussis in countries with high vaccination rates using the age-period-cohort model. Changes in social contact rates according to age, reduction in immune boosting opportunities by natural exposure, and variations in pertussis pathogens may be the cause of re-emergence. As a result of the analysis, the sharpest increase in the incidence of pertussis in the infant group was observed, suggesting that securing maternal immunity is important.

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Cohort Profile
Cohort profile: the Ewha Birth and Growth Study
Hye Ah Lee, Bohyun Park, Jungwon Min, Eun Jeong Choi, Ui Jeong Kim, Hyun Jin Park, Eun Ae Park, Su Jin Cho, Hae Soon Kim, Hwayoung Lee, Young Ju Kim, Young Sun Hong, Eui-Jung Kim, Eun Hee Ha, Hyesook Park
Epidemiol Health. 2021;43:e2021016.   Published online February 22, 2021
DOI: https://doi.org/10.4178/epih.e2021016
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
With the introduction of life-course epidemiology, researchers realized the importance of identifying risk factors in early life to prevent chronic diseases. This led to the establishment of the Ewha Birth and Growth Study in 2001; the study is a prospective birth cohort designed to provide evidence of early life risk factors for a child’s growth and health. Participants were recruited from those who visited Ewha Womans University Mokdong Hospital (a tertiary hospital in southwest Seoul, Korea) for prenatal care at 24-28 weeks of gestation. In total, 891 mothers enrolled in this study between 2001 and 2006 and their offspring (n=940) were followed-up. Regular check-up examinations of offspring were conducted at 3 years, 5 years, and 7 years of age and every year thereafter. To consider age-related health issues, extensive data were collected using questionnaires and measurements. In 2021, the study subjects will reach 19 years of age, and we are planning a check-up examination for early adulthood. About 20 years have passed since the cohort data were collected, and we have published results on childhood health outcomes associated with prenatal and birth characteristics, genetic and epigenetic characteristics related to childhood metabolism, the effects of exposure to endocrine disruptors, and dietary patterns in childhood. Recently, we started reporting on topics related to adolescent health. The findings will facilitate identification of early life risk factors for chronic diseases and the development of interventions for diseases later in life.
Summary
Korean summary
이화영아성장코호트는 만성질환 예방을 위한 생애초기 위험인자에 대한 근거를 제공하기 위해 2001년에 시작되었습니다. 이화영아성장코호트는 국내에서 선도적인 장기 추적관찰 연구로, 소아기 건강과 관련된 산전 및 출생 시 특징, 소아기 대사와 관련된 유전적 혹은 후성학적 특성, 내분비 장애물질 노출에 따른 영향, 소아기의 식이패턴과 같은 다양한 연구결과들을 발표하였습니다. 추후 청년기의 자료 수집을 계획하고 있으며, 우리의 연구결과는 만성질환 예방을 위한 중재 개발에 기여할 것으로 기대됩니다.
Key Message
To provide evidence of early life risk factors for the prevention of chronic diseases, the Ewha Birth and Growth Study was started in 2001. The Ewha Birth and Growth cohort is a leading long-term follow-up study in Korea, and we have published results on childhood health outcomes associated with prenatal and birth characteristics, genetic and epigenetic characteristics related to childhood metabolism, the effects of exposure to endocrine disruptors, and dietary patterns in childhood. We are planning to collect data for early adulthood, and our findings will contribute to the development of interventions to prevent chronic diseases.

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    Eun Jeong Choi, Hye Ah Lee, Bomi Park, Bohyun Park, Hae Soon Kim, Young Sun Hong, Hyesook Park
    Scientific Reports.2021;[Epub]     CrossRef
Original Article
An age-period-cohort analysis of the difference in smoking prevalence between urban and non-urban areas in Japan (2004–2019)
Tasuku Okui
Epidemiol Health. 2020;42:e2020072.   Published online December 1, 2020
DOI: https://doi.org/10.4178/epih.e2020072
  • 28,899 View
  • 255 Download
  • 22 Web of Science
  • 19 Crossref
AbstractAbstract PDFSupplementary Material
Abstract
OBJECTIVES
This study aimed to conduct an age-period-cohort (APC) analysis of smoking prevalence trends in urban and non-urban areas in Japan.
METHODS
Data on smoking prevalence from 2004 to 2019 were extracted from the Comprehensive Survey of Living Conditions in Japan. Government ordinance-designated cities and special wards in Tokyo were defined as urban areas. The respondents ranged from 20 years to 79 years old, and were grouped in 5-year intervals. Cohorts were defined for each age group of each year, and those born between 1925-1929 and 1995-1999 were examined. We calculated the estimated smoking prevalence for each age, period, and cohort, as well as the smoking prevalence ratio of non-urban areas compared with urban areas from the APC analysis results.
RESULTS
The magnitude of the decrease in the period effect on smoking prevalence was larger in urban areas than in non-urban areas for both men and women. The smoking prevalence ratio for non-urban areas compared with that of urban areas was above 1 for men at most time points, except in the older age groups. In addition, the prevalence ratio between the areas decreased, particularly as age increased. For women, the smoking prevalence ratio in non-urban areas compared to urban areas was below 1 until cohorts born in the 1970s, but the trend reversed thereafter.
CONCLUSIONS
The results of this study suggest that further smoking control and cessation measures are necessary, particularly for older cohorts in urban women and for younger ages in non-urban men.
Summary

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  • An analysis of associations of having children with smoking prevalence and intensity using nationally representative survey data in Japan
    Tasuku Okui
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  • Evaluating trends in cigarette and HTP use in Japan and measurement issues in the National Health and Nutrition Survey
    David T Levy, Mona Issabakhsh, Kenneth E Warner, Alex Liber, Rafael Meza, Michael Cummings
    Tobacco Control.2025; 34(5): 659.     CrossRef
  • Estimating the Prevalence of and Clarifying Factors Associated With Multiple Tobacco Product Use in Japan: A Cross-sectional Study in 2022
    Takafumi Yamamoto, Hazem Abbas, Upul Cooray, Tetsuji Yokoyama, Takahiro Tabuchi
    Journal of Epidemiology.2025; 35(5): 222.     CrossRef
  • International Comparison of Geriatric‐Associated Variables in Major Gastroenterological Surgery Between National Clinical Database and American College of Surgeons National Surgical Quality Improvement Program
    Yasuhide Kofunato, Xane Peters, Arata Takahashi, Mark E. Cohen, Hiraku Kumamaru, Mitsukazu Gotoh, Yoshihiro Kakeji, Yasuyuki Seto, Yuko Kitagawa, Ken Shirabe, Hideki Ueno, Hiroaki Miyata, Clifford Y. Ko, Shigeru Marubashi
    Annals of Gastroenterological Surgery.2025; 9(5): 1093.     CrossRef
  • Effectiveness of a Digital Peer-Supported App Intervention in Promoting Smoking Cessations: Nonrandomized Controlled Trial
    Shota Yoshihara, Kayoko Takahashi, Chiaki Uemura, Shin Murakami, Daichi Harada, Hiroshi Yamato
    JMIR mHealth and uHealth.2025; 13: e68638.     CrossRef
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    Diyan Ermawan Effendi, Irfan Ardani, Sri Handayani, Rozana Ika Agustiya, Arief Priyo Nugroho, Oktriyanto Oktriyanto, Astridya Paramita, Deasy Febriyanty, Risqa Novita, Aris Yulianto
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  • Urological cancer statistics on incidence from 1975 to 2019 and mortality from 1958 to 2022 in Japan
    Takeshi Sasaki, Takahiro Higashi, Takahiro Inoue
    International Journal of Clinical Oncology.2024; 29(8): 1088.     CrossRef
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    Wenkai Jiang, Caifei Xiang, Yan Du, Xin Li, Wence Zhou
    International Journal of Environmental Research and Public Health.2023; 20(2): 1552.     CrossRef
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    Yuko Noda, Ryuhei So, Misaki Sonoda, Takahiro Tabuchi, Akihiro Nomura
    Journal of Medical Internet Research.2023; 25: e42776.     CrossRef
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    Kuiwu Ren, Chunlong Liu, Ziqiang He, Panpan Wu, Jian Zhang, Rui Yang, Tao Cui, Kun Song, Di Cheng, Kui He, Jiangtao Yu
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    Yu-Rung Wang, Huan-Fang Lee, Pei-Lun Hsieh, Chia-Hsiu Chang, Ching-Min Chen
    BMC Nursing.2023;[Epub]     CrossRef
  • Regional Differences in the Prevalence of Atopic Dermatitis among Schoolchildren in Japan and Its Associated Factors from 2006 to 2018
    Tasuku Okui, Naoki Nakashima
    Allergies.2022; 2(2): 33.     CrossRef
  • Association of Esophageal Cancer Mortality with Municipal Socioeconomic Deprivation Level in Japan, 2013–2017: An Ecological Study Using Nationwide Data
    Tasuku Okui, Akie Hirata, Naoki Nakashima
    International Journal of Environmental Research and Public Health.2022; 19(9): 5483.     CrossRef
  • Trends in Deaths Attributable to Smoking in China, Japan, United Kingdom, and United States From 1990 to 2019
    Haoyu Wen, Cong Xie, Fang Shi, Yan Liu, Xiaoxue Liu, Chuanhua Yu
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    Sera Kim, Garam Byun, Garam Jo, Dahyun Park, Sung-Il Cho, Hannah Oh, Rockli Kim, S V Subramanian, Sungha Yun, Kyungwon Oh, Jong-Tae Lee, Min-Jeong Shin
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  • Decreased head circumference at birth associated with maternal tobacco smoke exposure during pregnancy on the Japanese prospective birth cohort study
    Tadashi Shiohama, Aya Hisada, Midori Yamamoto, Kenichi Sakurai, Rieko Takatani, Katsunori Fujii, Naoki Shimojo, Chisato Mori, Michihiro Kamijima, Shin Yamazaki, Yukihiro Ohya, Reiko Kishi, Nobuo Yaegashi, Koichi Hashimoto, Chisato Mori, Shuichi Ito, Zenta
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    Tasuku Okui
    BMC Public Health.2021;[Epub]     CrossRef
  • Geographical Differences and Their Associated Factors in Chronic Obstructive Pulmonary Disease Mortality in Japan: An Ecological Study Using Nationwide Data
    Tasuku Okui, Jinsang Park
    International Journal of Environmental Research and Public Health.2021; 18(24): 13393.     CrossRef
  • Trend of asthma prevalence among children based on regional urbanization level in Japan; 2006–2019
    Tasuku Okui
    Environmental Analysis Health and Toxicology.2021; 36(4): e2021027.     CrossRef
Brief Communication
Prospective cohort data quality assurance and quality control strategy and method: Korea HIV/AIDS Cohort Study
Soo Min Kim, Yunsu Choi, Bo Youl Choi, Minjeong Kim, Sang Il Kim, Jun Young Choi, Shin-Woo Kim, Joon Young Song, Youn Jeong Kim, Mee-Kyung Kee, Myeongsu Yoo, Jeong Gyu Lee, Bo Young Park
Epidemiol Health. 2020;42:e2020063.   Published online September 4, 2020
DOI: https://doi.org/10.4178/epih.e2020063
  • 24,871 View
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
The aim of effective data quality control and management is to minimize the impact of errors on study results by identifying and correcting them. This study presents the results of a data quality control system for the Korea HIV/AIDS Cohort Study that took into account the characteristics of the data.
METHODS
The HIV/AIDS Cohort Study in Korea conducts repeated measurements every 6 months using an electronic survey administered to voluntarily consenting participants and collects data from 21 hospitals. In total, 5,795 sets of data from 1,442 participants were collected from the first investigation in 2006 to 2016. The data refining results of 2015 and 2019 were converted into the data refining rate and compared.
RESULTS
The quality control system involved 3 steps at different points in the process, and each step contributed to data quality management and results. By improving data quality control in the pre-phase and the data collection phase, the estimated error value in 2019 was 1,803, reflecting a 53.9% reduction from 2015. Due to improvements in the stage after data collection, the data refining rate was 92.7% in 2019, a 24.21%p increase from 2015.
CONCLUSIONS
Despite this quality management strategy, errors may still exist at each stage. Logically possible errors for the post-review refining of downloaded data should be actively identified with appropriate consideration of the purpose and epidemiological characteristics of the study data. To improve data quality and reliability, data management strategies should be systematically implemented.
Summary
Korean summary
이 연구는 한국 에이즈 코호트 자료의 연구 목적과 역학적 특성을 고려한 체계적인 질 관리 방법과 결과를 제시한다. 시간적 선후 관계를 고려한 로직을 활용한 자료정제 과정을 비롯한 3단계의 체계적인 질 관리 방법은 이제껏 없었던 국내 코호트 자료 질 관리에 도움이 될 것으로 사료된다.

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    Arezoo Abasi, Haleh Ayatollahi, Seyed Abbas Motevalian
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  • 한국 HIV/AIDS 코호트 연구의 과거, 현재, 그리고 미래
    윤수 최, 윤정 김, 보영 박, 준용 최, 신우 김, 준영 송, 보율 최, 상일 김
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    Belmiro Sousa, Sergio Chiale, Hayley Bryant, Lisa Dulli, Tanya Medrano
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  • Effect of characteristics on the clinical course at the initiation of treatment for human immunodeficiency virus infection using dimensionality reduction
    Yunsu Choi, Bo Youl Choi, Sang Il Kim, Jungsoon Choi, Jieun Kim, Bo Young Park, Soo Min Kim, Shin-Woo Kim, Jun Yong Choi, Joon Young Song, Youn Jeong Kim, Hyo Youl Kim, Jin-Soo Lee, Jung Ho Kim, Yoon Hee Jun, Myungsun Lee, Jaehyun Seong
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Cohort Profiles
Cohort profile: congenital Zika virus infection and child neurodevelopmental outcomes in the ZEN cohort study in Colombia
Maritza Gonzalez, Van T. Tong, Helena Rodriguez, Diana Valencia, Jacqueline Acosta, Margaret A. Honein, Martha L. Ospina, The ZEN Study Team
Epidemiol Health. 2020;42:e2020060.   Published online August 31, 2020
DOI: https://doi.org/10.4178/epih.e2020060
  • 25,001 View
  • 238 Download
  • 8 Web of Science
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AbstractAbstract PDF
Abstract
<i>Zika en Embarazadas y Niños</i> (ZEN) is a prospective cohort study designed to identify risk factors and modifiers for Zika virus (ZIKV) infection in pregnant women, partners, and infants, as well as to assess the risk for adverse maternal, fetal, infant, and childhood outcomes of ZIKV and other congenital infections. ZIKV infection during pregnancy may be associated with longterm sequelae. In the ZEN cohort, 1,519 pregnant women and 287 partners were enrolled from 3 departments within Colombia between February 2017 and January 2018, as well as 1,108 infants born to the pregnant women who were followed to 6 months. The data include baseline questionnaires at enrollment; repeated symptoms and study follow-up questionnaires; the results of lab tests to detect ZIKV and other congenital infections; medical record abstractions; infant physical, eye, and hearing exams; and developmental screening tests. Follow-up of 850 mother-child dyads occurred at 9 months, 12 months, and 18 months with developmental screenings, physical exams, and parent questionnaires. The data will be pooled with those from other prospective cohort studies for an individual participant data meta-analysis of ZIKV infection during pregnancy to characterize pregnancy outcomes and sequelae in children.
Summary

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  • Building a growing genomic repository for maternal and fetal health through the PING Consortium
    Clara M. Abdelmalek, Shriya Singh, Blain Fasil, Allison R. Horvath, Sarah B. Mulkey, Carlos Curé, Maribel Campos, Denise P. Cavalcanti, Van T. Tong, Marcela Mercado, Marcela Daza, Mónica Marcela Benavides, Jacqueline Acosta, Suzanne Gilboa, Diana Valencia
    Pediatric Research.2025; 98(2): 519.     CrossRef
  • Neurodevelopmental assessment of normocephalic children born to Zika virus exposed and unexposed pregnant people
    Jackeline Alger, María Luisa Cafferata, Raquel López, Lisa D. Wiggins, Allison Callejas, Mario Castillo, Jenny Fúnes, Fátima Rico, Diana Valencia, Douglas Varela, Zulma Alvarez, Mabel Berrueta, Harry Bock, Carolina Bustillo, Alejandra Calderón, Alvaro Cig
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  • Zika virus prevention behaviors and knowledge among male partners of pregnant people and lack of condom use as a prevention behavior from the Zika en Embarazadas y Niños (ZEN) prospective cohort study, Colombia
    Christina L. Sancken, Ayzsa Tannis, Sandra A. Amouzou, Veronica Burkel, Jeffrey M. Carlson, Suzanne Newton, Suzanne M. Gilboa, Maritza Gonzalez, Diana Valencia, Van T. Tong, Martha Ospina
    BMC Research Notes.2024;[Epub]     CrossRef
  • Zika virus knowledge, attitudes and prevention behaviors among pregnant women in the ZEN cohort study, Colombia, 2017–2018
    Veronica K Burkel, Suzanne M Newton, Jacqueline Acosta, Diana Valencia, Monica Benavides, Van T Tong, Marcela Daza, Christina Sancken, Maritza Gonzalez, Kara Polen, Helena Rodriguez, Milena Borbón, Carol Y Rao, Suzanne M Gilboa, Margaret A Honein, Marta L
    Transactions of The Royal Society of Tropical Medicine and Hygiene.2023; 117(7): 496.     CrossRef
  • Epidemiology of cytomegalovirus Infection among mothers and infants in Colombia
    Angelica Rico, Sheila C. Dollard, Diana Valencia, Sheryll Corchuelo, Van T. Tong, Katherine Laiton‐Donato, Minal M. Amin, Monica Benavides, Phili Wong, Suzanne Newton, Marcela Daza, Jordan Cates, Maritza Gonzalez, Laura D. Zambrano, Marcela M. Mercado, El
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    Youssef A. Kousa, Reafa A. Hossain
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Cohort profile: the Kisalaya cohort of mother-infant dyads in rural south India (2008-2012)
Smitha Chandrashekarappa, Krupa Modi, Karl Krupp, Kavitha Ravi, Anisa Khan, Vijaya Srinivas, Poornima Jaykrishna, Anjali Arun, Murali Krishna, Purnima Madhivanan
Epidemiol Health. 2020;42:e2020010.   Published online March 11, 2020
DOI: https://doi.org/10.4178/epih.e2020010
  • 23,505 View
  • 179 Download
  • 2 Web of Science
  • 1 Crossref
AbstractAbstract PDF
Abstract
The <i>Kisalaya</i> cohort was established in 2008, providing integrated antenatal care (ANC) and human immunodeficiency virus (HIV) testing in order to reduce adverse birth outcomes and pediatric HIV infections. The program used a mobile clinic model to deliver health education, ANC, and HIV/sexually transmitted infection testing and management to pregnant women in rural communities in southern India. This cohort includes pregnant women residing in 144 villages of the Mysuru <i>taluk (a rural region) who received ANC through the mobile clinic and delivered their infants between 2008 and 2011. Of the 1,940 women registered for ANC at primary healthcare centers during this time period, 1,675 (75.6%) were enrolled in the <i>Kisalaya</i> cohort. Once women enrolled in the <i>Kisalaya</i> cohort gave birth, the cohort expanded to include the mother-infant dyads with a retention rate of 100% at follow-up visits at 15 days and at 6 months post-delivery. The baseline data collected during the <i>Kisalaya</i> study included both questionnaire-based data and laboratory-based investigations. Presently, a study entitled “<i>Early life influences on adolescent mental health: a life course study of the Kisalaya birth cohort in south India</i>” is in the process of data collection (2019-2020).
Summary

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  • Vulnerability to Sexually Transmitted Infections (STI) / Human Immunodeficiency Virus (HIV) among adolescent girls and young women in India: A rapid review
    Sohini Paul, Anupam Sharma, Radhika Dayal, Mahika Mehta, Sudeshna Maitra, Kuhika Seth, Monal Nagrath, Sowmya Ramesh, Niranjan Saggurti, Ajoke Basirat Akinola
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Original Articles
Impact of secondhand smoke exposure in former smokers on their subsequent risk of coronary heart disease: evidence from the population-based cohort of the Tehran Lipid and Glucose Study
Masoumeh Sadeghi, Maryam S. Daneshpour, Soheila Khodakarim, Amir Abbas Momenan, Mahdi Akbarzadeh, Hamid Soori
Epidemiol Health. 2020;42:e2020009.   Published online March 8, 2020
DOI: https://doi.org/10.4178/epih.e2020009
  • 29,452 View
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  • 10 Web of Science
  • 11 Crossref
AbstractAbstract PDF
Abstract
OBJECTIVES
Cigarette smoking is an established, strong, and modifiable risk factor for coronary heart disease (CHD). However, little research has investigated CHD risk in former smokers who continue to be exposed to others’ cigarette smoke (former & secondhand smokers).
METHODS
In the Tehran Lipid and Glucose Study, a prospective population-based cohort (n=20,069) was followed up for a median period of 14.6 years. A subset of 8,050 participants of 30 years of age and older was analyzed, with first CHD events as the study outcome. Participants were categorized as never, former, current, secondhand, and former & secondhand smokers. Data on smoking intensity (cigarette/d) were also collected. A Cox proportional hazards regression model was applied to estimate the risk of CHD, taking into account the main potential confounders.
RESULTS
The mean age of participants was 46.10 ±11.38 years, and they experienced 1,118 first CHD events (with most CHD cases in former smokers) during the follow-up period. The risk of CHD was highest in current smokers, followed in order by former & secondhand, former, and secondhand smokers (hazard ratio [HR], 1.99; 95% confidence interval [CI], 1.65 to 2.39; HR, 1.55; 95% CI, 1.15 to 2.08; HR, 1.39; 95% CI, 1.12 to 1.72; HR, 1.27; 95% CI, 1.07 to 1.51, respectively), compared to never smokers. The risk of CHD increased with smoking intensity, which has been proposed as a preferable measure of smoking, indicating a dose-response pattern.
CONCLUSIONS
The elevated risk of CHD in former & secondhand smokers was a noteworthy finding, with possible implications for health policy; however, further research is needed.
Summary

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    Luisa S. Flor, Jason A. Anderson, Noah Ahmad, Aleksandr Aravkin, Sinclair Carr, Xiaochen Dai, Gabriela F. Gil, Simon I. Hay, Matthew J. Malloy, Susan A. McLaughlin, Erin C. Mullany, Christopher J. L. Murray, Erin M. O’Connell, Chukwuma Okereke, Reed J. D.
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    Hui Yang, Ya-Mei Luo, Cai-Yi Ma, Tian-Yu Zhang, Tao Zhou, Xiao-Lei Ren, Xiao-Lin He, Ke-Jun Deng, Dan Yan, Hua Tang, Hao Lin
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    Fatemeh Jabbari, Anoushiravan Mohseni Bandpei, Maryam S. Daneshpour, Abbas Shahsavani, Seyed Saeed Hashemi Nazari, Hassanali Faraji Sabokbar, Amir abbas Momenan, Fereidoun Azizi
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Prevalence of sexual experience among Korean adolescent: age-period-cohort analysis
Yongho Jee, Gyuyoung Lee
Epidemiol Health. 2020;42:e2020008.   Published online March 3, 2020
DOI: https://doi.org/10.4178/epih.e2020008
  • 39,174 View
  • 245 Download
  • 12 Web of Science
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AbstractAbstract AbstractSummary PDF
Abstract
OBJECTIVES
Since exposure to sexual content and early sexual initiation among adolescents have become serious social issues in Korea, an in-depth analysis of trends in the prevalence of sexual experience among Korean adolescents is necessary to project the trends and policies required for the next 10 years. The objective of this study was to identify the contributions of age, period, and birth cohort effects on the prevalence of sexual experience in Korean adolescents.
METHODS
We analyzed age-specific, period-specific, and birth cohort–specific trends in the prevalence of sexual experience among 911,502 adolescents (469,593 boys, 51.5%; 441,909 girls, 48.5%) aged 12 years to 17 years from the 2006 to 2017 Korean Youth Risk Behavior Web-based Survey. Joinpoint regression analysis was conducted to examine significant changes in the prevalence of sexual experience and to find the optimal number and location of places where trends changed.
RESULTS
The prevalence of sexual experience generally increased with age in all periods in both boys and girls. In boys, the prevalence of sexual experience increased in recent periods, especially in the age group of 12-13 years, while the prevalence of sexual experience decreased in the age group of 16-17 years. In girls, the age group of 12-13 years showed an increased prevalence of sexual experience in recent periods. However, the prevalence showed a decreasing trend in the age group of 16-17 years.
CONCLUSIONS
In boys and girls, sexual experience increased with age, although this tendency has slowed in recent cohorts. Therefore, early sex education is needed.
Summary
Korean summary
성경험 유병률은 일반적으로 남녀 공히 모든 시기에서 연령대에 따라 증가했다. 공통적으로 최근 연도에서 12-13세 연령군의 성 경험 유병률이 증가한 반면 16-17세 연령군에서 성경험 유병률이 감소했다. 전반적으로 2006 년부터 2017 년까지 청소년들의 성경험률은 소폭 감소했지만, 조기 성경험의 빈도는 증가하고 있다. 따라서 피임이나 순결 교육뿐만 아니라 성적자기결정능력같은 보다 실질적인 성교육이 어릴 때부터 강화되어야 할 것으로 보인다.

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Cohort Profile
Health Effects of Underground Workspaces cohort: study design and baseline characteristics
Gerard Dunleavy, Thirunavukkarasu Sathish, Nuraini Nazeha, Michael Soljak, Nanthini Visvalingam, Ram Bajpai, Hui Shan Yap, Adam C. Roberts, Thuan Quoc Thach, André Comiran Tonon, Chee Kiong Soh, Georgios Christopoulos, Kei Long Cheung, Hein de Vries, Josip Car
Epidemiol Health. 2019;41:e2019025.   Published online August 16, 2019
DOI: https://doi.org/10.4178/epih.e2019025
  • 32,183 View
  • 226 Download
  • 15 Web of Science
  • 15 Crossref
AbstractAbstract PDFSupplementary Material
Abstract
The development of underground workspaces is a strategic effort towards healthy urban growth in cities with ever-increasing land scarcity. Despite the growth in underground workspaces, there is limited information regarding the impact of this environment on workers’ health. The Health Effects of Underground Workspaces (HEUW) study is a cohort study that was set up to examine the health effects of working in underground workspaces. In this paper, we describe the rationale for the study, study design, data collection, and baseline characteristics of participants. The HEUW study recruited 464 participants at baseline, of whom 424 (91.4%) were followed-up at 3 months and 334 (72.0%) at 12 months from baseline. We used standardized and validated questionnaires to collect information on socio-demographic and lifestyle characteristics, medical history, family history of chronic diseases, sleep quality, health-related quality of life, chronotype, psychological distress, occupational factors, and comfort levels with indoor environmental quality parameters. Clinical and anthropometric parameters including blood pressure, spirometry, height, weight, and waist and hip circumference were also measured. Biochemical tests of participants’ blood and urine samples were conducted to measure levels of glucose, lipids, and melatonin. We also conducted objective measurements of individuals’ workplace environment, assessing air quality, light intensity, temperature, thermal comfort, and bacterial and fungal counts. The findings this study will help to identify modifiable lifestyle and environmental parameters that are negatively affecting workers’ health. The findings may be used to guide the development of more health-promoting workspaces that attempt to negate any potential deleterious health effects from working in underground workspaces.
Summary

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    Shenglin Ye, Zhengtao Ai, Xiaohong Liu, Zhongbing Liu, Rongpeng Zhang
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    Nuraini Nazeha, Thirunavukkarasu Sathish, Michael Soljak, Gerard Dunleavy, Nanthini Visvalingam, Ushashree Divakar, Ram Chandra Bajpai, Chee Kiong Soh, George Christopoulos, Josip Car
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    Nanthini Visvalingam, Thirunavukkarasu Sathish, Michael Soljak, Ai-Ping Chua, Gerard Dunleavy, Ushashree Divakar, Nuraini Nazeha, Ram Bajpai, Chee Kiong Soh, Kwok Kian Woon, Georgios Christopoulos, Josip Car
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Original Article
Incidence of varicella in children in Jeju-do, Korea, 2005-2016: age-period-cohort analysis
Jinhee Kim, Ji-Eun Kim, Jong-Myon Bae
Epidemiol Health. 2018;40:e2018054.   Published online November 8, 2018
DOI: https://doi.org/10.4178/epih.e2018054
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Although the nationwide inoculation rate of varicella vaccine was approximately 95% in Korean children recently, the number of notified varicella cases is unexpectedly continuously increasing till now. To suggest some hypotheses regarding this discrepancy, an age-period-cohort (APC) analysis as a descriptive epidemiology study was conducted for children residing in Jeju-do, Korea.
METHODS
The raw data were obtained from the nationwide database for insurance claim of healthcare fee provided by the National Health Insurance Service, Korea. The selection criteria were children aged 2-13 years who visited any healthcare center due to varicella from 2005 to 2016 while residing in Jeju-do. After calculating the birth cohort-specific crude incidence rates by age and year, the intrinsic estimator method was used to perform the APC analysis.
RESULTS
As the annual crude incidence rates decreased with increasing age between 2005 and 2016, the age and period effects also decreased. The intrinsic estimator coefficients suggesting the cohort effect shifted from positive to negative in 2011, the starting year of free varicella vaccine program in Jeju-do.
CONCLUSIONS
The results suggested that inoculated varicella vaccines have preventive effects. However, further studies to evaluate waning immunity would be needed.
Summary
Korean summary
2011년 이후 생후 12-15개월 유아에게 수두백신 무상접종을 시행해 오고 있는 제주도에 있어서, 수두발생 신고건수가 증가하는 괴리 현상에 있어, 국민건강보험공단의 수진자료를 확보하여 연령-기간-코호트 (age-period-cohort, APC) 분석을 시행하였다. 그 결과 연령이 증가하고 연도가 최근으로 올수록 수두 발생에 대한 연령과 기간효과는 점점 감소하는 반면, 수두백신 무상접종이 시작된 2011년을 전후해서 코호트 효과는 양에서 음으로 전환하였다. 따라서 현재 접종하고 있는 수두 백신은 수두발생을 예방하는 효과가 있으며, 돌발수두 발생은 이차백신 실패로 볼 수 있다.

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    Zuhal Umit, Zumrut Sahbudak Bal, Aysin Zeytinoglu, Tansu Gulbahar Aydogan, Ozlem Bag, Gizem Guner Ozenen, Ferda Ozkinay, Zafer Kurugol
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Cohort Profile
Korea HIV/AIDS Cohort Study: study design and baseline characteristics
Bo Youl Choi, Jun Yong Choi, Sang Hoon Han, Sang Il Kim, Mee-Kyung Kee, Min Ja Kim, Shin-Woo Kim, Sung Soon Kim, Yu-Mi Kim, Nam Su Ku, Jin-Soo Lee, Joo-Shil Lee, Yunsu Choi, Kyong Sil Park, Joon Young Song, Jun Hee Woo, Moon Won Kang, June Kim
Epidemiol Health. 2018;40:e2018023.   Published online June 6, 2018
DOI: https://doi.org/10.4178/epih.e2018023
  • 30,545 View
  • 410 Download
  • 20 Web of Science
  • 20 Crossref
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
The number of persons infected by HIV/AIDS has consistently increased in Korea since the first case of HIV/AIDS infection in 1985 and reached 15,208 by 2016. About 1,100 new patients with HIV/ AIDS infections have emerged every year since 2013. In Korea, the Korea HIV/AIDS Cohort Study was established for the evidenced-based prevention, treatment, and effective management of patients infected with human immunodeficiency virus (HIV) in December 2006. This study monitored 1,438 patients, who accounted for about 10% of all patients with HIV/AIDS in Korea, for 10 years with the following aims: (1) to develop an administrative system for the establishment of a HIV/AIDS cohort-based study; (2) to standardize methodologies and the case report forms; and (3) to standardize multi-cohort data and develop a data cleaning method. This study aims to monitor at least 1,000 patients (excluding those for whom investigation had been completed) per year (estimated number of patients who can be monitored by January 2018: 939). By December 2016, the sex distribution was 93.3% for men, and 6.7% for women (gender ratio, 13.9:1.0), and 98.9% of all participants were Korean. More than 50.0% of the participants were confirmed as HIV positive after 2006. This study reports competitive, long-term research that aimed to develop policies for the prevention of chronic infectious diseases for patients with HIV. The data collected over the last decade will be used to develop indices for HIV treatment and health promotion.
Summary
Korean summary
세계적으로 HIV 감염인은 감소하고 있으나, 한국의 HIV 감염은 증가하여 2013년 이후 매년 1,000명이 넘는 신규 감염인이 보고되고 있다. HIV/AIDS 코호트 연구진은 2006년부터 HIV 감염인과 AIDS 환자를 대상으로 6개월 간격의 반복 조사를 시행하여 역학과 임상 자료를 수집하여 데이터베이스를 구축하고, 생물검체를 채취하여 인체자원은행에 보관하여, HIV/AIDS의 발생 기전을 구명하고, 자연사를 파악하며, 예방과 진단, 치료, 관리 방법을 개발하기 위한 기초와 임상, 역학 연구에 활용하고 있다.

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