Journal of Preventive Medicine and Public Health

Daehee Kang

21 Articles

Sleep Duration, Comorbidities, and Mortality in Korean Health Examinees: A Prospective Cohort Study: Sukhong Min, Woo-Kyoung Shin, Katherine De la Torre, Dan Huang, Hyung-Suk Yoon, Aesun Shin, Ji-Yeob Choi, Daehee Kang; J Prev Med Public Health. 2023;56(5):458-466. Published online September 26, 2023; DOI: https://doi.org/10.3961/jpmph.23.311

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Objectives
The association between long sleep duration and mortality is frequently attributed to the confounding influence of comorbidities. Nevertheless, past efforts to account for comorbidities have yielded inconsistent outcomes. The objective of this study was to evaluate this relationship using a large prospective cohort in Korea.
Methods
The study included 114 205 participants from the Health Examinees Study, who were followed for a median of 9.1 years. A composite comorbidity score was developed to summarize the effects of 21 diseases. Using Cox proportional hazards regression, hazard ratios (HRs) and 95% confidence intervals (CIs) for all-cause, cancer, and cardiovascular mortality associated with sleep duration were estimated. These estimates were adjusted for socio-demographic factors, lifestyle factors, body mass index, and comorbidity score. Additionally, a stratified analysis by subgroups with and without comorbidities was conducted.
Results
Throughout the follow-up period, 2675 deaths were recorded. After all adjustments, an association was observed between a sleep duration of 8 hours or more and all-cause mortality (HR, 1.10; 95% CI, 1.01 to 1.20). However, no such association was detected in the stratified analysis for the subgroups based on comorbidity status.
Conclusions
Long sleep duration was found to be associated with all-cause mortality among Koreans, even after adjusting for comorbidities. Additional studies are required to explore the mechanism underlying the association between sleep duration and major causes of mortality.

Summary

Korean summary
- 한국의 대규모 코호트 자료를 이용, 긴 수면 시간과 사망률 간의 연관성이 동반 상병으로 인한 교란 효과로 인한 것인지를 검토하였다. - 수면 시간과 총 사망률, 암 사망률, 심혈관질환 사망률 간의 연관성을 확인하였고, 이 중 총 사망률과 긴 수면 시간이 동반 상병 지수로 보정 한 뒤에도 유의한 연관성을 보였다.

Key Message
Using a large prospective cohort in Korea, the association between long sleep duration and mortality was evaluated, after adjusting for the confounding influence of comorbidities. When 114,205 participants from the Health Examinees Study were followed for a median of 9.1 years, sleep duration of 8 hours or more were found to be associated with all-cause mortality (HR, 1.10; 95% CI, 1.01 to 1.20). Additional studies are required to explore the mechanism underlying the association between sleep duration and major causes of mortality.

Citations

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Imbalanced sleep increases mortality risk by 14–34%: a meta-analysis
Zoltan Ungvari, Mónika Fekete, Péter Varga, János Tibor Fekete, Andrea Lehoczki, Annamaria Buda, Ágnes Szappanos, György Purebl, Anna Ungvari, Balázs Győrffy
GeroScience.2025;[Epub] CrossRef
Non-linear association of sleep duration with osteoarthritis among U.S. middle-aged and older adults
Guoliang Ma, Bo Xu, Zhizhuang Wang, Weili Duan, Xin Chen, Liguo Zhu, Bowen Yang, Dian Zhang, Xiaokuan Qin, He Yin, Xu Wei
BMC Public Health.2024;[Epub] CrossRef

The Korea Cohort Consortium: The Future of Pooling Cohort Studies: Sangjun Lee, Kwang-Pil Ko, Jung Eun Lee, Inah Kim, Sun Ha Jee, Aesun Shin, Sun-Seog Kweon, Min-Ho Shin, Sangmin Park, Seungho Ryu, Sun Young Yang, Seung Ho Choi, Jeongseon Kim, Sang-Wook Yi, Daehee Kang, Keun-Young Yoo, Sue K. Park; J Prev Med Public Health. 2022;55(5):464-474. Published online September 12, 2022; DOI: https://doi.org/10.3961/jpmph.22.299

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Abstract Summary PDF Supplementary Material

Objectives
We introduced the cohort studies included in the Korea Cohort Consortium (KCC), focusing on large-scale cohort studies established in Korea with a prolonged follow-up period. Moreover, we also provided projections of the follow-up and estimates of the sample size that would be necessary for big-data analyses based on pooling established cohort studies, including population-based genomic studies.
Methods
We mainly focused on the characteristics of individual cohort studies from the KCC. We developed “PROFAN”, a Shiny application for projecting the follow-up period to achieve a certain number of cases when pooling established cohort studies. As examples, we projected the follow-up periods for 5000 cases of gastric cancer, 2500 cases of prostate and breast cancer, and 500 cases of non-Hodgkin lymphoma. The sample sizes for sequencing-based analyses based on a 1:1 case-control study were also calculated.
Results
The KCC consisted of 8 individual cohort studies, of which 3 were community-based and 5 were health screening-based cohorts. The population-based cohort studies were mainly organized by Korean government agencies and research institutes. The projected follow-up period was at least 10 years to achieve 5000 cases based on a cohort of 0.5 million participants. The mean of the minimum to maximum sample sizes for performing sequencing analyses was 5917-72 102.
Conclusions
We propose an approach to establish a large-scale consortium based on the standardization and harmonization of existing cohort studies to obtain adequate statistical power with a sufficient sample size to analyze high-risk groups or rare cancer subtypes.

Summary

Korean summary
한국 코호트 컨소시엄(KCC)은 “2015년 한국의 생활 습관 및 환경 요인에 따른 암 기여분율” 프로젝트의 3단계 과업으로써, 본 프로젝트에 참여한 기존의 구축된 개인 코호트 연구의 연구자들을 주도로 다수의 대규모 한국 코호트 연구를 기반으로 구성되었다. 따라서 본 연구는 KCC에 포함된 한국 코호트 연구를 소개하는 것을 목표로 하였다. 또한 여러 기 확립된 국제 컨소시엄을 기반으로 빅데이터 기반 코호트 풀링 연구의 중요성을 제시하였다.

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Sangjun Lee, Sungji Moon, Kyungsik Kim, Soseul Sung, Youjin Hong, Woojin Lim, Sue K. Park
Journal of Preventive Medicine and Public Health.2024; 57(5): 499. CrossRef
Comparison of Population Attributable Fractions of Cancer Incidence and Mortality Linked to Excess Body Weight in Korea from 2015 to 2030
Youjin Hong, Jihye An, Jeehi Jung, Hyeon Sook Lee, Soseul Sung, Sungji Moon, Inah Kim, Jung Eun Lee, Aesun Shin, Sun Ha Jee, Sun-Seog Kweon, Min-Ho Shin, Sangmin Park, Seung-Ho Ryu, Sun Young Yang, Seung Ho Choi, Jeongseon Kim, Sang-Wook Yi, Yoon-Jung Cho
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The relationship between regional inequalities in the provision of emergency health services and other health services
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Validity of Self-reported Stroke and Myocardial Infarction in Korea: The Health Examinees (HEXA) Study: Sunho Choe, Joonki Lee, Jeeyoo Lee, Daehee Kang, Jong-Koo Lee, Aesun Shin; J Prev Med Public Health. 2019;52(6):377-383. Published online November 12, 2019; DOI: https://doi.org/10.3961/jpmph.19.089

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Abstract PDF

Objectives
Self-reported disease history is often used in epidemiological studies. In this study, we acquired the hospital records of subjects who self-reported stroke or myocardial infarction (MI) and evaluated the validity of the participants’ self-reported disease history. We also determined the level of agreement between specialists and non-specialists.
Methods
Among the participants in the Health Examinees study, 1488 subjects self-reported stroke or MI during 2012-2017, and medical records were acquired for the 429 subjects (28.8%) who agreed to share their medical information. Each record was independently assigned to 2 medical doctors for review. The records were classified as ‘definite,’ ‘possible,’ or ‘not’ stroke or MI. If the doctors did not agree, a third doctor made the final decision. The positive predictive value (PPV) of self-reporting was calculated with the doctors’ review as the gold standard. Kappa statistics were used to compare the results between general doctors and neurologists or cardiologists.
Results
Medical records from 208 patients with self-reported stroke and 221 patients with self-reported MI were reviewed. The PPV of self-reported disease history was 51.4% for stroke and 32.6% for MI. If cases classified as ‘possible’ were counted as positive diagnoses, the PPV was 59.1% for stroke and 33.5% for MI. Kappa statistics showed moderate levels of agreement between specialists and non-specialists for both stroke and MI.
Conclusions
The validity of self-reported disease was lower than expected, especially in those who reported having been diagnosed with MI. Proper consideration is needed when using these self-reported data in further studies.

Summary

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Risk Reduction of Breast Cancer by Childbirth, Breastfeeding, and Their Interaction in Korean Women: Heterogeneous Effects Across Menopausal Status, Hormone Receptor Status, and Pathological Subtypes: Seok Hun Jeong, Yoon Suk An, Ji-Yeob Choi, Boyoung Park, Daehee Kang, Min Hyuk Lee, Wonshik Han, Dong Young Noh, Keun-Young Yoo, Sue K. Park; J Prev Med Public Health. 2017;50(6):401-410. Published online November 10, 2017; DOI: https://doi.org/10.3961/jpmph.17.152

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Abstract PDF Supplementary Material

Objectives
The purpose of this study was to examine the associations of childbirth, breastfeeding, and their interaction with breast cancer (BC) risk reduction, and to evaluate the heterogeneity in the BC risk reduction effects of these factors by menopause, hormone receptor (HR) status, and pathological subtype.
Methods
BC patients aged 40+ from the Korean Breast Cancer Registry in 2004-2012 and controls from the Health Examinee cohort participants were included in this study after 1:1 matching (12 889 pairs) by age and enrollment year. BC risk according to childbirth, breast-feeding, and their interaction was calculated in logistic regression models using odds ratios (ORs) and 95% confidence intervals (CIs).
Results
BC risk decreased with childbirth (3+ childbirths relative to 1 childbirth: OR, 0.66; 95% CI, 0.56 to 0.78 and OR, 0.80; 95% CI, 0.68 to 0.95 in postmenopausal and premenopausal women, respectively); and the degree of risk reduction by the number of children was heterogeneous according to menopausal status (p-heterogeneity=0.04), HR status (p-heterogeneity<0.001), and pathological subtype (p-heterogeneity<0.001); whereas breastfeeding for 1-12 months showed a heterogeneous association with BC risk according to menopausal status, with risk reduction only in premenopausal women (p-heterogeneity<0.05). The combination of 2 more childbirths and breastfeeding for ≥13 months had a much stronger BC risk reduction of 49% (OR, 0.51; 95% CI, 0.45 to 0.58).
Conclusions
This study suggests that the combination of longer breastfeeding and more childbirths reduces BC risk more strongly, and that women who experience both 2 or more childbirths and breastfeed for ≥13 months can reduce their BC risk by about 50%.

Summary

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The Effect of Breastfeeding Duration and Parity on the Risk of Epithelial Ovarian Cancer: A Systematic Review and Meta-analysis: Ho Kyung Sung, Seung Hyun Ma, Ji-Yeob Choi, Yunji Hwang, Choonghyun Ahn, Byoung-Gie Kim, Yong-Man Kim, Jae Weon Kim, Sokbom Kang, Jaehoon Kim, Tae Jin Kim, Keun-Young Yoo, Daehee Kang, Suekyung Park; J Prev Med Public Health. 2016;49(6):349-366. Published online September 8, 2016; DOI: https://doi.org/10.3961/jpmph.16.066

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Abstract PDF Supplementary Material

Objectives
We conducted a systematic review and meta-analysis to summarize current evidence regarding the association of parity and duration of breastfeeding with the risk of epithelial ovarian cancer (EOC).
Methods
A systematic search of relevant studies published by December 31, 2015 was performed in PubMed and EMBASE. A random-effect model was used to obtain the summary relative risks (RRs) and 95% confidence intervals (CIs).
Results
Thirty-two studies had parity categories of 1, 2, and ≥3. The summary RRs for EOC were 0.72 (95% CI, 0.65 to 0.79), 0.57 (95% CI, 0.49 to 0.65), and 0.46 (95% CI, 0.41 to 0.52), respectively. Small to moderate heterogeneity was observed for one birth (p<0.01; Q=59.46; I²=47.9%). Fifteen studies had breastfeeding categories of <6 months, 6-12 months, and >13 months. The summary RRs were 0.79 (95% CI, 0.72 to 0.87), 0.72 (95% CI, 0.64 to 0.81), and 0.67 (95% CI, 0.56 to 0.79), respectively. Only small heterogeneity was observed for <6 months of breastfeeding (p=0.17; Q=18.79, I²=25.5%). Compared to nulliparous women with no history of breastfeeding, the joint effects of two births and <6 months of breastfeeding resulted in a 0.5-fold reduced risk for EOC.
Conclusions
The first birth and breastfeeding for <6 months were associated with significant reductions in EOC risk.

Summary

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Determinants of Poor Self-rated Health in Korean Adults With Diabetes: Hwi-Won Lee, Minkyo Song, Jae Jeong Yang, Daehee Kang; J Prev Med Public Health. 2015;48(6):287-300. Published online October 23, 2015; DOI: https://doi.org/10.3961/jpmph.15.048

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Abstract PDF Supplementary Material

Objectives
Self-rated health is a measure of perceived health widely used in epidemiological studies. Our study investigated the determinants of poor self-rated health in middle-aged Korean adults with diabetes.
Methods
A cross-sectional study was conducted based on the Health Examinees Study. A total of 9759 adults aged 40 to 69 years who reported having physician-diagnosed diabetes were analyzed with regard to a range of health determinants, including sociodemographic, lifestyle, psychosocial, and physical variables, in association with self-rated health status using multivariate logistic regression models. A p-value <0.05 was considered to indicate statistical significance.
Results
We found that negative psychosocial conditions, including frequent stress events and severe distress according to the psychosocial well-being index, were most strongly associated with poor self-rated health (odds ratio [OR]_{Frequent stress events}, 5.40; 95% confidence interval [CI], 4.63 to 6.29; OR_{Severe distress}, 11.08; 95% CI, 8.77 to 14.00). Moreover, younger age and being underweight or obese were shown to be associated with poor self-rated health. Physical factors relating to participants’ medical history of diabetes, such as a younger age at diagnosis, a longer duration of diabetes, insulin therapy, hemoglobin A_1c levels of 6.5% or more, and comorbidities, were other correlates of poor reported health.
Conclusions
Our findings suggest that, in addition to medical variables, unfavorable socioeconomic factors, and adverse lifestyle behaviors, younger age, being underweight or obese, and psychosocial stress could be distinc factors in predicting negative perceived health status in Korean adults with diabetes.

Summary

Citations

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Association of Selected Medical Conditions With Breast Cancer Risk in Korea: Sun Jae Jung, Minkyo Song, Ji-Yeob Choi, Nan Song, Sue Kyung Park, Keun-Young Yoo, Daehee Kang; J Prev Med Public Health. 2013;46(6):346-352. Published online November 28, 2013; DOI: https://doi.org/10.3961/jpmph.2013.46.6.346

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Abstract PDF

Objectives

To estimate the effect of medical conditions in the population of Korea on breast cancer risk in a case-control study.

Methods

The cases were 3242 women with incident, histologically confirmed breast cancer in two major hospitals interviewed between 2001 and 2007. The controls were 1818 women each admitted to either of those two hospitals for a variety of non-neoplastic conditions. Information on each disease was obtained from a standardized questionnaire by trained personnel. Odds ratios (ORs) for each disease were derived from multiple logistic regression adjusted for age, age of menarche, pregnancy, age of first pregnancy, and family history of breast cancer.

Results

Among all of the incident breast cancer patients, pre-existing diabetes (OR, 1.33; 95% confidence interval [CI], 0.99 to 1.78), hypertension (OR, 1.46; 95% CI, 1.18 to 1.83), thyroid diseases (OR, 1.26; 95% CI, 1.00 to 1.58), and ovarian diseases (OR, 1.70; 95% CI, 1.23 to 2.35) were associated with an increased risk of breast cancer when other factors were adjusted for. In a stratified analysis by menopausal status, pre-existing hypertension (pre-menopause OR, 0.80; 95% CI, 0.48 to 1.34 vs. post-menopause OR, 1.87; 95% CI, 1.44 to 2.43; p-heterogeneity <0.01) and ovarian disease (pre-menopause OR, 4.20; 95% CI, 1.91 to 9.24 vs. post-menopause OR, 1.39; 95% CI, 1.02 to 1.91; p-heterogeneity 0.01) showed significantly different risks of breast cancer.

Conclusions

Our results suggest the possibility that medical conditions such as hypertension affect breast cancer development, and that this can differ by menopausal status. Our study also indicates a possible correlation between ovarian diseases and breast cancer risk.

Summary

Citations

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A Prospective Cohort Study on the Relationship of Sleep Duration With All-cause and Disease-specific Mortality in the Korean Multi-center Cancer Cohort Study: Yohwan Yeo, Seung Hyun Ma, Sue Kyung Park, Soung-Hoon Chang, Hai-Rim Shin, Daehee Kang, Keun-Young Yoo; J Prev Med Public Health. 2013;46(5):271-281. Published online September 30, 2013; DOI: https://doi.org/10.3961/jpmph.2013.46.5.271

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Abstract PDF

Objectives

Emerging evidence indicates that sleep duration is associated with health outcomes. However, the relationship of sleep duration with long-term health is unclear. This study was designed to determine the relationship of sleep duration with mortality as a parameter for long-term health in a large prospective cohort study in Korea.

Methods

The study population included 13 164 participants aged over 20 years from the Korean Multi-center Cancer Cohort study. Information on sleep duration was obtained through a structured questionnaire interview. The hazard ratios (HRs) and 95% confidence intervals (CIs) for mortality were estimated using a Cox regression model. The non-linear relationship between sleep duration and mortality was examined non-parametrically using restricted cubic splines.

Results

The HRs for all-cause mortality showed a U-shape, with the lowest point at sleep duration of 7 to 8 hours. There was an increased risk of death among persons with sleep duration of ≤5 hours (HR, 1.21; 95% CI, 1.03 to 1.41) and of ≥10 hours (HR, 1.36; 95% CI, 1.07 to 1.72). In stratified analysis, this relationship of HR was seen in women and in participants aged ≥60 years. Risk of cardiovascular disease-specific mortality was associated with a sleep duration of ≤5 hours (HR, 1.40; 95% CI, 1.02 to 1.93). Risk of death from respiratory disease was associated with sleep duration at both extremes (≤5 and ≥10 hours).

Conclusions

Sleep durations of 7 to 8 hours may be recommended to the public for a general healthy lifestyle in Korea.

Summary

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Interaction of Body Mass Index and Diabetes as Modifiers of Cardiovascular Mortality in a Cohort Study: Seung Hyun Ma, Bo-Young Park, Jae Jeong Yang, En-Joo Jung, Yohwan Yeo, Yungi Whang, Soung-Hoon Chang, Hai-Rim Shin, Daehee Kang, Keun-Young Yoo, Sue Kyung Park; J Prev Med Public Health. 2012;45(6):394-401. Published online November 29, 2012; DOI: https://doi.org/10.3961/jpmph.2012.45.6.394

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Abstract PDF

Objectives

Diabetes and obesity each increases mortality, but recent papers have shown that lean Asian persons were at greater risk for mortality than were obese persons. The objective of this study is to determine whether an interaction exists between body mass index (BMI) and diabetes, which can modify the risk of death by cardiovascular disease (CVD).

Methods

Subjects who were over 20 years of age, and who had information regarding BMI, past history of diabetes, and fasting blood glucose levels (n=16 048), were selected from the Korea Multi-center Cancer Cohort study participants. By 2008, a total of 1290 participants had died; 251 and 155 had died of CVD and stroke, respectively. The hazard for deaths was calculated with hazard ratio (HR) and 95% confidence interval (95% CI) by Cox proportional hazard model.

Results

Compared with the normal population, patients with diabetes were at higher risk for CVD and stroke deaths (HR, 1.84; 95% CI, 1.33 to 2.56; HR, 1.82; 95% CI, 1.20 to 2.76; respectively). Relative to subjects with no diabetes and normal BMI (21 to 22.9 kg/m²), lean subjects with diabetes (BMI <21 kg/m²) had a greater risk for CVD and stroke deaths (HR, 2.83; 95% CI, 1.57 to 5.09; HR, 3.27; 95% CI, 1.58 to 6.76; respectively), while obese subjects with diabetes (BMI ≥25 kg/m²) had no increased death risk (p-interaction <0.05). This pattern was consistent in sub-populations with no incidence of hypertension.

Conclusions

This study suggests that diabetes in lean people is more critical to CVD deaths than it is in obese people.

Summary

Citations

Citations to this article as recorded by

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Alcohol Consumption and Mortality in the Korean Multi-center Cancer Cohort Study: En-Joo Jung, Aesun Shin, Sue K. Park, Seung-Hyun Ma, In-Seong Cho, Boyoung Park, Eun-Ha Lee, Soung-Hoon Chang, Hai-Rim Shin, Daehee Kang, Keun-Young Yoo; J Prev Med Public Health. 2012;45(5):301-308. Published online September 28, 2012; DOI: https://doi.org/10.3961/jpmph.2012.45.5.301

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Abstract PDF

Objectives

To examine the association between alcohol consumption habit, types of beverages, alcohol consumption quantity, and overall and cancer-specific mortality among Korean adults.

Methods

The alcohol consumption information of a total of 16 320 participants who were 20 years or older from the Korean Multi-center Cancer Cohort were analyzed to examine the association between alcohol consumption habit and mortality (median follow-up of 9.3 years). The Cox proportional hazard model was used to estimate the hazard ratio (HR) of alcohol consumption to mortality adjusting for age, sex, geographic areas, education, smoking status, and body mass index.

Results

Alcohol drinkers showed an increased risk for total mortality compared with never drinkers (HR, 1.72; 95% confidence interval [CI], 1.38 to 2.14 for past drinkers; HR, 1.21; 95% CI, 1.06 to 1.39 for current drinkers), while past drinkers only were associated with higher risk for cancer deaths (HR, 1.84; 95% CI, 1.34 to 2.53). The quantity of alcohol consumed per week showed a J-shaped association with risk of mortality. Relative to light drinkers (0.01 to 90 g/wk), never drinkers and heavy drinkers (>504 g/wk) had an increased risk for all-cause and cancer deaths: (HR, 1.18; 95% CI, 0.96 to 1.45) and (HR, 1.39; 95% CI, 1.05 to 1.83) for all-cause mortality; and (HR, 1.55; 95% CI, 1.15 to 2.11) and (HR, 2.07; 95% CI, 1.39 to 3.09) for all cancer mortality, respectively. Heavy drinkers (>504 g/wk) showed an elevated risk for death from stomach and liver cancers.

Conclusions

The present study supports the existence of a J-shaped association between alcohol consumption quantity and the risk of all-cause and cancer deaths. Heavy drinkers had an increased risk of death from cancer overall and liver and stomach cancer.

Summary

Citations

Citations to this article as recorded by

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Sohee Park, Hai-Rim Shin, Boram Lee, Aesun Shin, Kyu-Won Jung, Duk-Hee Lee, Sun Ha Jee, Sung-Il Cho, Sue Kyung Park, Mathieu Boniol, Paolo Boffetta, Elisabete Weiderpass
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Alcohol and liver cancer: a systematic review and meta-analysis of prospective studies
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Alcohol Consumption and Viral Load Are Synergistically Associated with CIN1
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Reliability and Data Integration of Duplicated Test Results Using Two Bioelectrical Impedence Analysis Machines in the Korean Genome and Epidemiology Study.: Boyoung Park, Jae Jeong Yang, Ji Hyun Yang, Jimin Kim, Lisa Y Cho, Daehee Kang, Chol Shin, Young Seoub Hong, Bo Youl Choi, Sung Soo Kim, Man Suck Park, Sue K Park; J Prev Med Public Health. 2010;43(6):479-485.; DOI: https://doi.org/10.3961/jpmph.2010.43.6.479

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OBJECTIVES
The Korean Genome and Epidemiology Study (KoGES), a multicenter-based multi-cohort study, has collected information on body composition using two different bioelectrical impedence analysis (BIA) machines. The aim of the study was to evaluate the possibility of whether the test values measured from different BIA machines can be integrated through statistical adjustment algorithm under excellent inter-rater reliability. METHODS: We selected two centers to measure inter-rater reliability of the two BIA machines. We set up the two machines side by side and measured subjects' body compositions between October 2007 and December 2007. Duplicated test values of 848 subjects were collected. Pearson and intra-class correlation coefficients for inter-rater reliability were estimated using results from the two machines. To detect the feasibility for data integration, we constructed statistical compensation models using linear regression models with residual analysis and R-square values. RESULTS: All correlation coefficients indicated excellent reliability except mineral mass. However, models using only duplicated body composition values for data integration were not feasible due to relatively low R2 values of 0.8 for mineral mass and target weight. To integrate body composition data, models adjusted for four empirical variables that were age, sex, weight and height were most ideal (all R2>0.9). CONCLUSIONS: The test values measured with the two BIA machines in the KoGES have excellent reliability for the nine body composition values. Based on reliability, values can be integrated through algorithmic statistical adjustment using regression equations that includes age, sex, weight, and height.

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Nutritional Consequences and Management After Gastrectomy
Jae-Moon Bae
Hanyang Medical Reviews.2011; 31(4): 254. CrossRef

Cigarette Smoking and Mortality in the Korean Multi-center Cancer Cohort (KMCC) Study.: Eun Ha Lee, Sue K Park, Kwang Pil Ko, In Seong Cho, Soung Hoon Chang, Hai Rim Shin, Daehee Kang, Keun Young Yoo; J Prev Med Public Health. 2010;43(2):151-158.; DOI: https://doi.org/10.3961/jpmph.2010.43.2.151

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OBJECTIVES
The aim of this study was to evaluate the association between cigarette smoking and total mortality, cancer mortality and other disease mortalities in Korean adults. METHODS: A total of 14 161 subjects of the Korean Multi-center Cancer Cohort who were over 40 years of age and who were cancer-free at baseline enrollment reported their lifestyle factors, including the smoking status. The median follow-up time was 6.6 years. During the follow-up period from 1993 to 2005, we identified 1159 cases of mortality, including 260 cancer mortality cases with a total of 91 987 person-years, by the national death certificate. Cox proportional hazard regression model was used to estimate the hazard ratio (HR) of cigarette smoking for total mortality, cancer mortality and disease-specific mortality, as adjusted for age, gender, the geographic area and year of enrollment, the alcohol consumption status, the education level and the body mass index (BMI). RESULTS: Cigarette smoking was significantly associated with an increased risk of total mortality, all-cancer mortality and lung cancer mortality (p-trend, <0.01, <0.01, <0.01, respectively). Compared to non-smoking, current smokers were at a higher risk for mortality [HR (95% CI)=1.3 (1.1-1.5) for total mortality; HR (95% CI)=1.6 (1.1-2.2) for all-cancer mortality; HR (95% CI)=3.9 (1.9-7.7) for lung cancer mortality]. CONCLUSIONS: This study's results suggest that cigarette smoking might be associated with total mortality, all-cancer mortality and especially lung cancer mortality among Korean adults.

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Identification and Application of Biomarkers in Molecular and Genomic Epidemiologic Research.: Kyoung Mu Lee, Sohee Han, Woong Yang Park, Daehee Kang; J Prev Med Public Health. 2009;42(6):349-355.; DOI: https://doi.org/10.3961/jpmph.2009.42.6.349

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Biomarkers are characteristic biological properties that can be detected and measured in a variety of biological matrices in the human body, including the blood and tissue, to give an indication of whether there is a threat of disease, if a disease already exists, or how such a disease may develop in an individual case. Along the continuum from exposure to clinical disease and progression, exposure, internal dose, biologically effective dose, early biological effect, altered structure and/or function, clinical disease, and disease progression can potentially be observed and quantified using biomarkers. While the traditional discovery of biomarkers has been a slow process, the advent of molecular and genomic medicine has resulted in explosive growth in the discovery of new biomarkers. In this review, issues in evaluating biomarkers will be discussed and the biomarkers of environmental exposure, early biologic effect, and susceptibility identified and validated in epidemiological studies will be summarized. The spectrum of genomic approaches currently used to identify and apply biomarkers and strategies to validate genomic biomarkers will also be discussed.

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Could 8-oxoguanine DNA glycosylase 1 Ser326Cys polymorphism be a biomarker of susceptibility in cancer?
Bensu Karahalil, Ayşe Başak Engin, Erdem Coşkun
Toxicology and Industrial Health.2014; 30(9): 814. CrossRef
Application of classic epidemiological studies and proteomics in research of occupational and environmental exposure to lead, cadmium and arsenic
Barbara Kossowska, Ilona Dudka, Roman Gancarz, Jolanta Antonowicz-Juchniewicz
International Journal of Hygiene and Environmental Health.2013; 216(1): 1. CrossRef
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Helmut Zarbl, Michael A. Gallo, James Glick, Ka Yee Yeung, Paul Vouros
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Stability and Intra-Individual Variation of Urinary Malondialdehyde and 2-Naphthol.: Kyoung Ho Lee, Daehee Kang; J Prev Med Public Health. 2008;41(3):195-199.; DOI: https://doi.org/10.3961/jpmph.2008.41.3.195

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OBJECTIVES
Malondialdehyde (MDA), a lipid peroxidation by-product, has been widely used as an indicator of oxidative stress. Urinary 2-naphthol, a urinary PAH metabolite, is used as a marker of ambient particulate exposure and is associated with lung cancer and chronic obstructive pulmonary disease. However, the stability and intra-individual variation associated with urinary MDA and 2-naphthol have not been thoroughly addressed. The objective of this study was to assess the stability and intraindividual variation associated with urinary MDA and 2-naphthol. METHODS: Urine samples were collected from 10 healthy volunteers (mean age 34, range 27~42 years old). Each sample was divided into three aliquots and stored under three different conditions. The levels of urinary MDA and 2-naphthol were analyzed 1) just after sampling, 2) after storage at room temperature (21degrees C) for 16 hours, and 3) after storage in a -20degrees C freezer for 16 hours. In addition, an epidemiological study was conducted in 44 Chinese subjects over a period of 3 weeks. The urinary MDA and 2-naphthol were measured by HPLC three times. RESULTS: There was no difference in the levels of urinary MDA and 2-naphthol between the triplicate measurements (n=10, p=0.84 and p=0.83, respectively). The intra-class correlation coefficients (ICC) for urinary MDA and 2-naphthol were 0.74 and 0.42, respectively. However, the levels of PM2.5 in the air were well correlated with the levels of both MDA and 2-naphthol in the epidemiological study. CONCLUSIONS: These results suggest that urinary MDA and 2-naphthol remain stable under variable storage conditions, even at room temperature for 16 hours, and indicate that these markers can be used in epidemiological studies involving various sample storage conditions. The intra-CC of urinary 2-naphthol and MDA were acceptable for application to epidemiological studies.

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Zoe E. Melvin, Hussein Dhirani, Christopher Mitchell, Tim R. B. Davenport, Jonathan D. Blount, Alexander V. Georgiev
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Analysis of urinary metabolites of polycyclic aromatic hydrocarbons and cotinine in pooled urine samples to determine the exposure to PAHs in an Australian population.
Phong K. Thai, Andrew P.W. Banks, Leisa-Maree L. Toms, Phil M. Choi, Xianyu Wang, Peter Hobson, Jochen F. Mueller
Environmental Research.2020; 182: 109048. CrossRef
Urinary markers of oxidative stress respond to infection and late-life in wild chimpanzees
Nicole Thompson González, Emily Otali, Zarin Machanda, Martin N. Muller, Richard Wrangham, Melissa Emery Thompson, Emmanuel Serrano
PLOS ONE.2020; 15(9): e0238066. CrossRef
Levels of malondialdehyde in the gastric juice: Its association with Helicobacter pylori infection and stomach diseases
Yao‐Kuang Wang, Wei‐Chih Chiang, Fu‐Chen Kuo, Meng‐Chieh Wu, Hsiang‐Yao Shih, Sophie S.W. Wang, Chung‐Jung Liu, Yen‐Hsu Chen, Deng‐Chyang Wu, Wei‐Wen Su, Yeou‐Lih Huang
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Mechanism of oxidative DNA damage induced by metabolites of carcinogenic naphthalene
Shiho Ohnishi, Yusuke Hiraku, Keishi Hasegawa, Kazutaka Hirakawa, Shinji Oikawa, Mariko Murata, Shosuke Kawanishi
Mutation Research/Genetic Toxicology and Environmental Mutagenesis.2018; 827: 42. CrossRef
Simultaneous pentafluorobenzyl derivatization and GC-ECNICI-MS measurement of nitrite and malondialdehyde in human urine: Close positive correlation between these disparate oxidative stress biomarkers
Erik Hanff, Michele F. Eisenga, Bibiana Beckmann, Stephan J.L. Bakker, Dimitrios Tsikas
Journal of Chromatography B.2017; 1043: 167. CrossRef
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Catherine C. Lerro, Laura E. Beane Freeman, Lützen Portengen, Daehee Kang, Kyoungho Lee, Aaron Blair, Charles F. Lynch, Berit Bakke, Anneclaire J. De Roos, Roel C.H. Vermeulen
Environmental and Molecular Mutagenesis.2017; 58(1): 30. CrossRef
Polycyclic aromatic hydrocarbon (1-OHPG and 2-naphthol) and oxidative stress (malondialdehyde) biomarkers in urine among Korean adults and children
Hyung-Suk Yoon, Kyoung-Mu Lee, Kyoung-Ho Lee, Sungkyoon Kim, Kyungho Choi, Daehee Kang
International Journal of Hygiene and Environmental Health.2012; 215(4): 458. CrossRef
Determination of urinary malondialdehyde by isotope dilution LC-MS/MS with automated solid-phase extraction: A cautionary note on derivatization optimization
Jian-Lian Chen, Yu-Jie Huang, Chih-Hong Pan, Chiung-Wen Hu, Mu-Rong Chao
Free Radical Biology and Medicine.2011; 51(9): 1823. CrossRef
Breast Cancer and Urinary Biomarkers of Polycyclic Aromatic Hydrocarbon and Oxidative Stress in the Shanghai Women's Health Study
Kyoung-Ho Lee, Xiao-Ou Shu, Yu-Tang Gao, Bu-Tian Ji, Gong Yang, Aaron Blair, Nathaniel Rothman, Wei Zheng, Wong-Ho Chow, Daehee Kang
Cancer Epidemiology, Biomarkers & Prevention.2010; 19(3): 877. CrossRef

Cigarette Smoking and Gastric Cancer Risk in a Community-based Cohort Study in Korea.: Yeonju Kim, Aesun Shin, Jin Gwack, Jae Kwan Jun, Sue Kyung Park, Daehee Kang, Hai Rim Shin, Soung Hoon Chang, Keun Young Yoo; J Prev Med Public Health. 2007;40(6):467-474.; DOI: https://doi.org/10.3961/jpmph.2007.40.6.467

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Abstract PDF

OBJECTIVES
Gastric cancer is the most common incident cancer in Korea. Although Helicobacter pylori infection is the most important risk factor for the development of gastric cancer, cigarette smoking has also been suggested to play an important role in the development of gastric cancer. The objective of this study is to evaluate the relationship between cigarette smoking and gastric cancer risk in a Korean population. METHODS: The study population consisted of 13,785 subjects who had been enrolled in the Korean Multi-Center Cancer Cohort between 1993 and 2002. As of December 2002, 139 incident gastric cancer cases were ascertained through the Korea Central Cancer Registry and the National Death Certificate Database. Relative risks (RR) and 95% confidence intervals (CI) for gastric cancer were estimated using CoxZs proportional hazard model adjusted for age, education, alcohol drinking status and history of gastritis or ulcer. RESULTS: Significant dose-response relationships were observed between the duration of smoking and the risk of gastric cancer among the male subjects in comparison to non-smokers: men who smoked for 20-39 years had a 2.09- fold (95% CI 1.00-4.38) increase, and those who smoked for more than 40 years had a 3.13-fold (95% CI 1.59-6.17) increase in the risk of gastric cancer (Ptrend<0.01). CONCLUSIONS: This study suggests that a longer duration of cigarette smoking may increase the risk of gastric cancer development in a dose-response manner in Korean men. The association between smoking and gastric cancer risk in women should be verified in future studies with a larger number of cases.

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Asher Lippe, Scott Lippe
Physician's Journal of Medicine.2022;[Epub] CrossRef
Cigarette smoking and gastric cancer in the Stomach Cancer Pooling (StoP) Project
Delphine Praud, Matteo Rota, Claudio Pelucchi, Paola Bertuccio, Tiziana Rosso, Carlotta Galeone, Zuo-Feng Zhang, Keitaro Matsuo, Hidemi Ito, Jinfu Hu, Kenneth C. Johnson, Guo-Pei Yu, Domenico Palli, Monica Ferraroni, Joshua Muscat, Nuno Lunet, Bárbara Pel
European Journal of Cancer Prevention.2018; 27(2): 124. CrossRef
Gender-related difference in the relationship between smoking status and periodontal diseases: the propensity score matching approach
Eun-Sil Choi, Hae-Young Kim
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Epidemiology and screening of gastric cancer in Korea
Minkyo Song, Hwi-Won Lee, Daehee Kang
Journal of the Korean Medical Association.2015; 58(3): 183. CrossRef
Cigarette smokers develop structurally modified hemoglobin: a possible way of increasing oxidative stress
Amartya Roy, Jyotirmoy Sikdar, Paromita Seal, Rajen Haldar
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Zhang MW, Jin MJ, Yu YX, Zhang SC, Liu B, Jiang X, Pan YF, Li QL, Ma XY, Chen K
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Gastric Cancer Epidemiology in Korea
Aesun Shin, Jeongseon Kim, Sohee Park
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Effect of chronic smoking on lipid peroxidation and antioxidant status in gastric carcinoma patients
Palanisamy Pasupathi, Ganesan Saravanan, Palanisamy Chinnaswamy, Govindaswamy Bakthavathsalam
Indian Journal of Gastroenterology.2009; 28(2): 65. CrossRef
The role of TNFgenetic variants and the interaction with cigarette smoking for gastric cancer risk: a nested case-control study
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Assessment of DNA Viability in Long Term-Stored Buffy Coat Species for the Korean Multicenter Cancer Cohort.: Mihi Yang, Jihyun Yoo, Cheong Sik Kim, Aesun Shin, Daehee Kang, Soung Hoon Chang, Sue Kyung Park, Hai Rim Shin, Keun Young Yoo; Korean J Prev Med. 2003;36(4):373-376.

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Abstract PDF: OBJECTIVES
Peripheral blood-buffy coat fractions (N = 14, 956) have been stored at -70degrees C in the headquarter of the Korean Multicenter Cancer Cohort (KMCC), since 1993. To study the future molecular etiology of cancers using specimens of the cohort, properly stored specimens are necessary. Therefore, the DNA-viability of the buffy coat samples was investigated. METHODS: Buffy coat fraction samples were randomly selected from various collection areas and years (N = 100). The DNA viability was evaluate from the UV-absorbent ratios at 260/280nm and the PCR for beta-globin was performed with genomic DNA isolated from the buffy coat. RESULTS: PCR products were obtained from 85 and 98% of the C and H area-samples, respectively, using 50 or 100mul of the buffy coat. There were significant differences in the yields of the PCR-amplifications from the C and H areas (p < 0.05), which was due to differences in the homogenization of the buffy coat fractions available as aliquots. The PCR-products were obtained from all of the samples (N = 7) stored at the C area-local center, but the other aliquots stored at the headquarter were not PCR-amplified. Therefore, the PCR products in almost all the samples, even including the DNA-degraded samples, were obtained. In addition, an improvement in the DNA isolation, i.e. approx. 1.6 fold, was found after using extra RBC lysis buffer. CONCLUSIONS: PCR products for beta-globin were obtained from nearly all of the samples. The regional differences in the PCR amplifications were thought to have originated from the different sample-preparation and homogenization performance. Therefore, the long term-stored buffy coat species at the KMCC can be used for future molecular studies.; Summary

Current Status of Genomic Epidemiology Research.: Daehee Kang, Kyoung Mu Lee; Korean J Prev Med. 2003;36(3):213-222.

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Abstract PDF: Genomic epidemiology is defined as "an evolving field of inquiring that uses the systematic application of epidemiologic methods and approaches in population-based studies of the impact of human genetic variation on health and disease (Khoury, 1998) ". Most human diseases are caused by the intricate interaction among environmental exposures and genetic susceptibility factors. Susceptibility genes involved in disease pathogenesis are categorized into two groups: high penetrance genes (i.e., BRAC1, RB, etc.) and low penetrance genes (i.e., GSTs, Cyps, XRCC1, ets.), and low penetrance susceptibility genes has the higher priority for epidemiological research due to high population attributable risk. In this paper, the summarized results of the association study between single nucleotide polymorphisms (SNPs) and breast cancer in Korea were introduced and the international trends of genomic epidemiology research were reviewed with an emphasis on internet-based case-control and cohort consortium.; Summary

Size of Prostatitis Symptoms Using Prostatitis Symptom Index(PSI): The Effect of Prostatitis Symptoms on Quality of Life.: Seok Soo Byun, Daehee Kang, Keun Young Yoo, Sue Kyung Park, Cheol Kwak, Moon Ki Jo, Hyeon Hoe Kim, Chongwook Lee; Korean J Prev Med. 2000;33(4):449-458.

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Abstract PDF: OBJECTIVES
To determine the prevalence of prostatitis symptoms in the general population by questionnaire survey and to measure the effect of prostatitis symptoms on quality of life(QOL). MATERIALS AND METHODS: A cross sectional community-based epidemiologic study was performed on 2,034 men, living in the Seoul metropolitan area using stepwise random sampling. Out of 2,034 interviewees, 1,356 men who were older than 40 and provided sufficient information were selected for this study. The questionnaires were completed by well trained interviewers. Contents of the questionnaires included demographic data, the Prostatitis Symptom Index(PSI), the International Prostate Symptom Score(IPSS), a general health questionnaire section and a sexual health questionnaire section. The PSI was composed of a sum of the scores from three questions about dysuria, penile pain and perineal pain and it ranged 0 to 12. Incidence of prostatitis symptoms was defined by a score of 4 or more and the reference group was defined as consisting of those with a score of 3 or less. The rate of incidence of prostatitis symptoms was assessed according to age and the difference of QOL between the prostatitis symptoms group and the reference group. RESULTS: The overall positive rate of prostatitis symptoms measured by the PSI, in men older than 40, living in the Seoul metropolitan area, was 4.5%(61/1,356), adjusted to 4.8% by the relative proportion of this age group in the general population of the Seoul metropolitan area as compared to Korea and the World. The proportion of the group with prostatitis symptoms assessed by the PSI did not increase with age although the proportion of participants with moderate to severe lower urinary tract symptoms (LUTS) did increase with age. The group with prostatitis symptoms suffered from a much greater incidence of LUTS compared to the reference group (p<0.05). The QOL scores of the IPSS, and the general health and sexual health status of the group with prostatitis symptoms, were worse than those of the reference group.(p<0.05). CONCLUSIONS: The positive rate of prostatitis symptoms in men older than 40, living in the Seoul metropolitan area, was 4.8% and it didn't increase with age. The general QOL of the group with prostatitis symptoms was much worse than that of the reference group.; Summary

Urinary 1-Hydroxypyrene and 2-Naphthol as a Biological Exposure Markers of Total Suspended Particulate in the General Population .: Jong Won Kang, Soo Hun Cho, Heon Kim, Daehee Kang, Chul Ho Lee; Korean J Prev Med. 2000;33(3):306-312.

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Abstract PDF: BACKGROUND
Polycyclic aromatic hydrocarbons (PAH) are well known environmental pollutants. The measurement of PAH in ambient air is not commonly used, because it is quite difficult to perform and is unreliable. Using biomarkers of PAH can be an alternative approach to this problem. The PAH in ambient air is absorbed in particulate matter. Total suspended particulate(TSP) or particulate matter of less than 10 micrometer in diameter (PM10) can be easily measured. Therefore, TSP or PM10 can be used as a surrogate measurements of ambient air PAH. CONCLUSIONS: We investigated whether the urinary concentration of two biomarkers of PAH, 1-hydroxypyrene (1-OHP) and 2-naphthol, could reflect the total suspended particulate in the general population. METHODS: In order to exclude the effects of occupational exposure and smoking, first grade middle school students were included in this study. Four middle schools within a one kilometer boundary of ambient air monitoring stations were selected. Total suspended particulate was regarded as the marker of airborne PAH. Diet and smoking data were collected by self administered questionnaires, and spot urine samples were collected. Urinary 1-OHP and 2-naphthol were analyzed by high performance liquid chromatography. RESULTS: The correlation between urinary 1-OHP, 2-naphthol and passive smoking was not statistically significant. The correlation between urinary 1-OHP and TSP indices was not statistically significant. The correlations between urinary 2-naphthol and TSP of two lag days, one lag day, and zero lag days were statistically significant. The statistical significance of two lag days was the strongest (p=0.001), one lag day was the next (p=0.0275), and zero lag days was the weakest (p=0.0349). CONCLUSION: Our results imply that the urinary concentration of 2-naphthol can be applied as a PAH exposure marker for the general population with low PAH exposure.; Summary

Development of Work-related Musculoskeletal Disorder Questionnaire Using Receiver Operating Characteristic Analysis.: Jaiyong Kim, Ho Jang Kwon, Yeongsu Ju, Soo Hun Cho, Daehee Kang, Joohon Sung, Seong Woo Choi, Jae Wook Choi, Jae Young Kim, Don Gyu Kim; Korean J Prev Med. 1999;32(3):361-373.

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Abstract PDF: OBJECTIVES
Receive Operating Characteristic(ROC) curve with the area under the ROC curve(AUC) is one of the most popular indicator to evaluate the criterion validity of the measurement tool. This study was conducted to develop a standardized questionnaire to discriminate workers at high-risk of work-related musculoskeletal disorders using ROC analysis. METHODS: The diagnostic results determined by rehabilitation medicine specialists in 370 persons(89 shipyard CAD workers, 113 telephone directory assistant operators, 79 women with occupation, and 89 housewives) were compared with participant's own replies to 'the questionnair on the worker's subjective physical symptoms'(Kwon, 1996). The AUC's from four models with different methods in item selection and weighting were compared with each other. These 4 models were applied to 225 persons, working in an assembly line of motor vehicle, for the purpose of AUC reliability test. RESULTS: In a weighted model with 11 items, the AUC was 0.8155 in the primary study population, and 0.8026 in the secondary study population(p=0.3780). It was superior in the aspects of discriminability, reliability and convenience. A new questionnaire of musculoskeletal disorder could be constructed by this model. CONCLUSION: A more valid questionnaire with a small number of items and the quantitative weight scores useful for the relative comparisons are the main results of this study. While the absolute reference value applicable to the wide range of populations was not estimated, the basic intent of this study, developing a surveillance tool through quantitative validation of the measures, would serve for the systematic disease prevention activities.; Summary

Laboratory-Acquired Infections with Hantavirus at a Research Unit of Medical School in Seoul, 1996.: Soo Hun Cho, Young Su Ju, Daehee Kang, Suhnggwon Kim, Ik Sang Kim, Sung Tae Hong; Korean J Prev Med. 1999;32(3):269-275.

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Abstract PDF: BACKGROUND
In April 6, 1996, a male researcher who has worked at a research unit at the Basic Research Building of Seoul National University(SNU) College of Medicine admitted to SNU Hospital due to persistent fever. He was diagnosed serologically as hemorrhagic fever with renal syndrome(HFRS). Another female researcher in the same unit was also diagnosed as HFRS at the same hospital several days later. Epidemic investigation of HFRS was conducted to determine the magnitude of the problems since these two cases were strongly suspected to have laboratory-acquired infections of HFRS. METHODS: All researchers and employees working at the Basic Research Building(BRB) of SNU College of Medicine as of April 1, 1996 were recruited for the study. Information on symptoms of HFRS and history of contact to experimental animals were collected by self-administered questionnaires and serological tests among study subjects were also conducted by indirect immunofluorescent antibody(IFA) to hantavirus. The experimental animals were also serologically tested for infection with hantavirus by IFA. RESULTS: Among 218 surveyed, six researchers and an animal caretaker had hantavirus antibodies above 1:20 in IFA titer. Five of seven sero-positive subjects had antibodies above 1:640 in IFA titer and had shown clinical symptoms compatible to HFRS during Jan. 1 to Apr. 20, 1996. The sero-positive persons had handled animals more frequently than sero-negative persons (OR, 19.68; 95% CI, 1.11 - 350.40) and handling animals at the animal quarter at School of Public Health(SPH) had shown consistently higher risk to get infected with hantavirus irrespective of types of animals handled (OR, 4.90 - 6.37). Sero-positivity of rats of the aniamal quarter at BRB was 30-60%, whereas 80% of rats at SPH tested were shown sero-positivity. CONCLUSION: There was a epidemic of HFRS in research units of a medical school during the period from Jan. through Apr. Further investigation is needed to determine the extent and the mode of transmission of the laboratory-acquired infection with hantavirus in other research facilities.; Summary

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