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Reliability of Quadruplicated Serological Parameters in the Korean Genome and Epidemiology Study
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Jae Jeong Yang, Ji Hyun Yang, Jimin Kim, Lisa Y. Cho, Boyoung Park, Seung Hyun Ma, Sang Hoon Song, Won-Ki Min, Sung Soo Kim, Man Suck Park, Sue K. Park
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Epidemiol Health. 2011;33:e2011004. Published online May 19, 2011
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DOI: https://doi.org/10.4178/epih/e2011004
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Abstract
<sec><title>OBJECTIVES</title><p>The aim of this study was to evaluate whether clinical test values from different laboratories in the Korean Genome and Epidemiology Study (KoGES) can be integrated through a statistical adjustment algorithm with appropriate intra- and inter-laboratory reliability.</p></sec><sec><title>METHODS</title><p>External quality control data were obtained from the Korean Society for Laboratory Medicine and quadruplicated standardized serological samples (N=3,200) were manufactured in order to check the intra- and inter-laboratory reliability for aspartic acid transaminase (AST), alanine transaminase (ALT), gamma-glutamyl transpeptidase (γ-GTP), blood urea nitrogen (BUN), creatinine, uric acid (UA), fasting blood sugar (FBS), cholesterol, and triglyceride (TG). As an index of inter- and intra-rater reliability, Pearson's correlation coefficient, intraclass correlation coefficients and kappa statistics were estimated. In addition, to detect the potential for data integration, we constructed statistical compensation models using linear regression analysis with residual analysis, and presented the R-square values.</p></sec><sec><title>RESULTS</title><p>All correlation coefficient values indicated good intra- and inter-laboratory reliability, which ranged from 0.842 to 1.000. Kappa coefficients were greater than 0.75 (0.75-1.00). All of the regression models based on the trial results had strong R-square values and zero sums of residuals. These results were consistent in the regression models using external quality control data.</p></sec><sec><title>CONCLUSION</title><p>The two laboratories in the KoGES have good intra- and inter-laboratory reliability for ten chemical test values, and data can be integrated through algorithmic statistical adjustment using regression equations.</p></sec>
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Correlation between YMCA step-test and maximum oxygen consumption (VO2max) as measurement tools for cardiorespiratory.
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On Lee, Sung Soo Kim, Yeon Soo Kim, Hyun Jin Son, Yu Mi Kim, Bo Youl Choi
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Korean J Epidemiol. 2008;30(1):73-81. Published online June 30, 2008
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DOI: https://doi.org/10.4178/kje.2008.30.1.73
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65,535
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The purpose of this study is to determine that YMCA step-test is useful method of cardiovascular fitness field-test for large scale study of epidemiology. 57 adults participated in this study. They are recruited considering subject's clinic status and gender proportion.
Cardiorespiratory fitness of each participant was determined by grade exercise testing(GXT) with gas analysis and YMCA step-test. There are at least more two days an interval between the tests. Data were analyzed with a statistics program, SPSS version 14.0, by applying Spearman correlation coefficient and independent t-test and Fisher's exact test with a statistical significant level of alpha<.05. The results of this study were as followed. VO2max value exhibited significant correlation with YMCA step test scale(male : r =-.611, p=.001 ; female: r=-.656, p>.001).
Our result is that validity of YMCA step-test is acceptable.
YMCA step test is vary efficient as dimension of investigator's and subject's effort then the other field-test for assessment of cardiorespiratory. Therefore, Step test is useful for large scale study of epidemiology.
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Epiderniologic Characteristics and Trends of Leptospirosis in Korea by Literature Review.
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Sung Soo Kim, Joung Soon Kim
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Korean J Epidemiol. 1994;16(1):66-83.
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In order to understand the epidemiologic characteristics and trends of Leptespirosis in Korea, year book of acute infectious disease and literatures published were thoroughly reviewed. The results obtained are as follows: 1. The outbreak of Leptospirosis in Korea has decreased during recent years. Most of the patients occured in Semptember, October, and November. Seventy nine percent of reported patients occured in north Choongchung, south Choongchung, and Kyunggi province in 1987-1991. 2. Leptospires isolation rates were ranged from 0.2% to 16.0% among normal healthy person, higher in rural residents than military personnels.
3. Total of 92 strains were isolated from human in six years from 1984 to 1990. Its main serogroups were Icterhaemorrhagiae and Canicola, predominantly consisted of serovar lai, copenhageni and canicola. Eighteen strains of Biflexa were also isolated from healthy persons and patients. 4. The proportion of Leptospirosis among patients with acute febrile episode has decreased since 1985.
Sero-positive rate of male among patients with acute febrile episode is higher than that of female. Sixty percent of sero-positive patients with acute febrile episode was older than 40-year of age. The seropositive rates were consistently the highest in harvest season than other seasons. Residents of north Choongchung, north Chunlla, south Chunlla, Kyunggi, and north Choongchung provinces showed higher seropositive rates than those of other ones.
Main serogroups positive to most sera of Koreans were Icterohaemorrhagiae and Canicola. 5. The sero-positive rate of normal healthy persons ranged from 2.0 to 25. 6% ; the sero-positive rate of rural area was 4 to 8 times higher than that of healthy urban people. Little difference was observed in sero-positive rate by age group among above 40 years old people, although it was higher in male by sex, in farmers by occupation and in some provinces by area.
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