Epidemiology and Health

Original Article

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

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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.

Citations

Citations to this article as recorded by

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

Data Profile

National Epidemiologic Survey of Thyroid cancer (NEST) in Korea: Chang-Mo Oh, Hyun-Joo Kong, Eunyang Kim, Hyejin Kim, Kyu-Won Jung, Sohee Park, Young-Joo Won; Epidemiol Health. 2018;40:e2018052. Published online October 26, 2018; DOI: https://doi.org/10.4178/epih.e2018052

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Abstract

The Korea Central Cancer Registry conducted the National Epidemiologic Survey of Thyroid cancer (NEST) to investigate changes in the epidemiological and clinical characteristics of thyroid cancer patients between 1999 and 2008. The NEST was designed to collect representative samples of patients with thyroid cancer diagnosed in the years 1999, 2005, and 2008 using a proportionally stratified and systematic random sampling method. Among 42,891 participants diagnosed with thyroid cancer, 5,796 participants were included in the final study population. This survey collected information on diagnostic methods and date, route of diagnosis, prior medical history and history of thyroid-related disease, tumor, lymph node, metastasis and collaborative stage, and treatment. The NEST dataset was also linked to the cause-of-death database from Statistics Korea. The mean age of the study participants was 46.9 years. The ratio of men to women was 1:5.5. In the analysis of the histologic type of cancer, the proportion of papillary thyroid carcinoma showed an increasing trend (p<0.01). In contrast, the proportion of distant metastasis and the mean tumor size of thyroid cancers showed decreasing trends over time (p<0.01, respectively).

Summary

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Original Article

The incidence of congenital hypothyroidism and its determinants from 2012 to 2014 in Shadegan, Iran: a case-control study: Ehsan Keshavarzian, Ali Asghar Valipoor, Mohammad Reza Maracy; Epidemiol Health. 2016;38:e2016021. Published online May 26, 2016; DOI: https://doi.org/10.4178/epih.e2016021

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Abstract PDF

Abstract

OBJECTIVES
Congenital hypothyroidism (CH) is one of the major causes of preventable mental retardation in infants. The aim of this study was to determine the incidence of CH in Shadegan, Khuzestan Province, Iran from 2012 to 2014 and to identify the risk factors associated with CH.

METHODS

A total of 203 cases were confirmed from 2012 to 2014 in Shadegan, with 66, 86, and 51 patients reported in 2012, 2013, and 2014, respectively. A total of 3,900, 3,991, and 4,050 live births occurred in 2012, 2013, and 2014, respectively. The controls (n=657) were selected using a random number table, and a case-control study was carried out to determine the risk factors for neonatal CH, including demographic, environmental, and medical factors.

RESULTS

The incidence of CH was 17.0 per 1,000 live births in 2012, 21.5 per 1,000 live births in 2013, and 12.6 per 1,000 live births in 2014. This study showed that the likelihood of CH in children born to parents with a history of consanguineous marriage was 2.41 times greater than in children born to parents with no such history (odds ratio, 2.41; 95% confidence interval [CI], 1.65 to 3.53). This study also found that CH was 3.4 times more likely (95% CI, 2.29 to 5.20) in infants born in urban settings than in infants born in rural areas.

CONCLUSIONS

The incidence of CH in Shadegan from 2012 to 2014 was approximately 17 times greater than the expected incidence in Iran. CH was associated with a history of consanguineous marriage and urbanization.

Summary

Citations

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Risk factors for transient and permanent congenital hypothyroidism: a population-based case-control study
Fariba Abbasi, Leila Janani, Malihe Talebi, Hosein Azizi, Lotfali Hagiri, Shahnaz Rimaz
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Pediatric Quality of Life in Congenital Hypothyroidism: an Indonesian Study
Nur Rochmah, Muhammad Faizi, Carrina Dewanti, Ahmad Suryawan
International Journal of Thyroidology.2020; 13(2): 150. CrossRef
Doğumsal Hipotiroidi ile Ebeveyn Yaşı İlişkisi
Hale TUHAN
Turkish Journal of Pediatric Disease.2019; : 1. CrossRef
The role of season and climate in the incidence of congenital hypothyroidism in Kerman province, Southeastern Iran
Narges Khanjani, Ahmad Ahmadzadeh, Bahram Bakhtiari, Farzan Madadizadeh
Journal of Pediatric Endocrinology and Metabolism.2017; 30(2): 149. CrossRef

Methods

Development and application of patient decision aids: Jong-Myon Bae; Epidemiol Health. 2015;37:e2015018. Published online April 8, 2015; DOI: https://doi.org/10.4178/epih/e2015018

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157 Download
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Abstract PDF Supplementary Material

Abstract

With the current overdiagnosis of thyroid cancer resulting from routine screening in Korea, it is necessary to educate the public that not all cancers are malignant. The exposure to patient decision aids (PtDAs) compared to usual care reduced the number of people choosing to undergo prostate-specific antigen screening. This article introduces the definition, usefulness, and developmental processes of PtDAs and suggests the urgent need for a Korean PtDA related to thyroid cancer screening.

Summary

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Overdiagnosis: epidemiologic concepts and estimation: Jong-Myon Bae; Epidemiol Health. 2015;37:e2015004. Published online February 10, 2015; DOI: https://doi.org/10.4178/epih/e2015004

25,421 View
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Abstract

Overdiagnosis of thyroid cancer was propounded regarding the rapidly increasing incidence in South Korea. Overdiagnosis is defined as ‘the detection of cancers that would never have been found were it not for the screening test’, and may be an extreme form of lead bias due to indolent cancers, as is inevitable when conducting a cancer screening programme. Because it is solely an epidemiological concept, it can be estimated indirectly by phenomena such as a lack of compensatory drop in post-screening periods, or discrepancies between incidence and mortality. The erstwhile trials for quantifying the overdiagnosis in screening mammography were reviewed in order to secure the data needed to establish its prevalence in South Korea.

Summary

Korean summary
최근 갑상선암의 발생 증가는 과진단에 기인한 것이란 주장이 제기되었다. 과진단은 ‘평생동안 몰랐을 암을 검진으로 알아낸 경우’로 정의하는 바, 예상보다 늦은 진행으로 예후가 더 좋고 치료를 안해도 사망률 변동을 만들지 못하는 암에 대하여 반복되는 암검진에 더 잘 진단되는 기간차이 바이어스가 개입되는 것을 제대로 통제하지 못해서 생긴 것이다. 검진을 더 이상 하지 않았을 경우 발생률이 본래대로 되돌아오지 않는 현상을 보이거나, 사망률과 발생률 간의 변동에서 큰 차이를 보일 때 과진단이 있다고 판단한다. 국내에서 발생하는 과진단의 크기를 측정하기 위한 방법들을 알아보기 위하여, 기존의 유방암 조기검진용 유방촬영술에 대한 과진단 크기를 알아낸 연구방법들을 살펴보았다.

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Original Article

Cohort Study of Risk Factors for Breast Cancer in Post Menopausal Women: Arthur J. Hartz, Tao He; Epidemiol Health. 2013;35:e2013003. Published online April 30, 2013; DOI: https://doi.org/10.4178/epih/e2013003

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Abstract PDF

Abstract

<sec><title>OBJECTIVES</title>The present study assessed more than 800 potential risk factors to identify new predictors of breast cancer and compare the independence and relative importance of established risk factors.</sec><sec><title>METHODS</title>Data were collected by the Women's Health Initiative and included 147,202 women ages 50 to 79 who were enrolled from 1993 to 1998 and followed for 8 years. Analyses performed in 2011 and 2012 used the Cox proportional hazard regression to test the association between more than 800 baseline risk factors and incident breast cancer.</sec><sec><title>RESULTS</title>Baseline factors independently associated with subsequent breast cancer at the p<0.001 level (in decreasing order of statistical significance) were breast aspiration, family history, age, weight, history of breast biopsies, estrogen and progestin use, fewer live births, greater age at menopause, history of thyroid cancer, breast tenderness, digitalis use, alcohol intake, white race, not restless, no vaginal dryness, relative with prostate cancer, colon polyps, smoking, no breast augmentation, and no osteoporosis. Risk factors previously reported that were not independently associated with breast cancer in the present study included socioeconomic status, months of breast feeding, age at first birth, adiposity measures, adult weight gain, timing of initiation of hormone therapy, and several dietary, psychological, and exercise variables. Family history was not found to alter the risk associated with other factors.</sec><sec><title>CONCLUSIONS</title>These results suggest that some risk factors not commonly studied may be important for breast cancer and some frequently cited risk factors may be relatively unimportant or secondary.</sec>

Summary

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