Incheon Workers Health Center

Incheon, South Korea

Incheon Workers Health Center

Incheon, South Korea
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Lee W.,Yonsei University | Lee W.,Incheon Workers Health Center | Lee S.,University of Occupational and Environmental Health Japan | Roh J.,Yonsei University | And 5 more authors.
Journal of Korean Medical Science | Year: 2017

Unintentional environmental exposure to toxicants is associated with an aggravated health status of the general population. Involuntary smoking (IS) exposure is one of the main routes to involuntary toxicants exposure. However, few studies have attempted to understand the environmental cadmium exposure by IS exposure in the general, nonsmoking population. The purpose of the current study was to examine the relationship between blood cadmium level and IS level according to gender and age. We used the Korea National Health and Nutrition Examination Survey (KNHANES) IV-VI data that included heavy metal and urine cotinine sampling with IS exposure history. The final analysis comprised 3,493 adults (1,231 males and 2,262 females) and 395 adolescents (210 males and 185 females). Linear regression was performed to estimate the association between self-reported IS exposure with urine cotinine level and blood cadmium level in non-smokers with gender and age group stratification. In final regression model, the effect values (B) (standard errors [SE]) between blood cadmium and urine cotinine level in men was 0.0004 (0.0001) and 0.0006 (0.0002) in adults and adolescents, the B (SE) in women was 0.0006 (0.0002) and 0.0016 (0.0006) in adults and adolescents. Our study revealed, for the first time, a significant association between blood cadmium and IS exposure in non-smokers. Greater efforts are needed to improve environmental justices of the general population from IS, considering the severe harmful effects of involuntary exposure to even a low level of cadmium. © 2017 The Korean Academy of Medical Sciences.


Lee S.,University of Occupational and Environmental Health Japan | Lee W.,Yonsei University | Lee W.,Incheon Workers Health Center | Roh J.,Yonsei University | And 5 more authors.
Journal of Occupational and Environmental Medicine | Year: 2017

Objective: The aim of this study was to determine the relationship between vibration and noise exposure in the workplace and certain nervous system related symptoms (NSRS) among Korean workers. Methods: Using data from the fourth Korean Working Conditions Survey, we investigated the influence of vibration and noise with three categories; none, mild, and severe, on sleep disturbance, overall fatigue, and headache/eye strain using logistic regression analysis with stratification by personal protective equipment (PPE) wearing status. Results: Severe noise/vibration exposure was associated in a dose-response fashion with NSRS; the odds ratios (ORs) for sleep disturbance, headache/eyestrain, and overall fatigue were 1.48/1.06, 1.46/1.26, and 1.56/1.28 for severe and mild noise/vibration exposure, respectively, compared with no exposure. Workers who did not wear PPEs were the most affected. Conclusions: Occupational exposures to vibration and noise are associated with NSRS. Additional longitudinal studies and tightened education and safety measures are warranted. © 2017 American College of Occupational and Environmental Medicine.


Kim J.,Yonsei University | Kim J.,Incheon Workers Health Center | Lee W.,Yonsei University | Lee W.,Incheon Workers Health Center | And 11 more authors.
PLoS ONE | Year: 2017

Introduction: The individual and combined effect of occupational noise and vibration exposures, on workers' health has not been thoroughly investigated. In order to find better ways to prevent and manage workers' headache, this study aimed to investigate the effects of occupational noise and vibration exposure on headache/eyestrain. Methods: We used data from the fourth Korean Working Condition Survey (2014). After applying inclusion and exclusion criteria, 25,751 workers were included. Occupational noise and vibration exposure and the prevalence of headache/eyestrain were investigated by self-reported survey. Chi-square tests were used to compare differences in baseline characteristics between the group with headache/eyestrain and the group without. Odds ratios and 95% confidence intervals were estimated using a logistic regression model adjusted for several covariates. Area under the receiver operating characteristics curve (AUROC) analysis was used to evaluate the effect of occupational noise and/or vibration exposure. Results: Among the 25,751 study subjects, 4,903 had experienced headache/eyestrain in the preceding year. There were significant differences in age, education level, household income, occupational classification, shift work, occupational vibration exposure, and occupational noise exposure between the two groups (all p<0.05). The odds ratios between each exposure and headache/eyestrain increased proportionally with the level of exposure, increasing from 1.08 to 1.26 with increasing vibration exposure, and from 1.25 to 1.41 with increasing noise exposure. According to the AUROC analysis, the predictive power of each exposure was significant, and increased when the two exposures were considered in combination. Discussion: The findings of this study show that both occupational noise and vibration exposures are associated with headache/eyestrain; noise exposure more strongly so. However, when the two exposures are considered in combination, the explanatory power for headache/eyestrain is increased. Therefore, efforts aimed at reducing and managing occupational noise and vibration exposure are crucial to maintaining workers' health. © 2017 Kim et al.This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Choi S.B.,Yonsei University | Lee W.,Yonsei University | Lee W.,Incheon Workers Health Center | Yoon J.-H.,Yonsei University | And 4 more authors.
BMC Public Health | Year: 2017

Background Suicide is a serious public health concern worldwide, and the fourth leading cause of death in Korea. Few studies have focused on risk factors for suicide attempt among people with suicidal ideation. The aim of the present study was to investigate the risk factors and develop prediction models for suicide attempt among people with suicidal ideation in the Korean population. Method This study included 1567 men and 3726 women aged 20 years and older who had suicidal ideation from the Korea National Health and Nutrition Examination Survey from 2007 to 2012. Among them, 106 men and 188 women attempted suicide. Multivariate logistic regression analysis with backward stepwise elimination was performed to find risk factors for suicide attempt. Sub-group analysis, dividing participants into under 50 and at least 50 years old was also performed. Results Among people with suicidal ideation, age, education, cancer, and depressive disorder were selected as risk factors for suicide attempt in men. Age, education, national basic livelihood security, daily activity limitation, depressive disorder, stress, smoking, and regular exercise were selected in women. Area under curves of our prediction models in men and women were 0.728 and 0.716, respectively. Conclusions It is important to pay attention to populations with suicidal ideation and the risk factors mentioned above. Prediction models using the determined risk factors could be useful to detect high-risk groups early for suicide attempt among people with suicidal ideation. It is necessary to develop specific action plans for these high-risk groups to prevent suicide. © 2017, The Author(s).


Yoon C.-G.,Yonsei University | Yoon C.-G.,Incheon Workers Health Center | Kang M.-Y.,Seoul National University | Yoon J.-H.,Yonsei University | Yoon J.-H.,Incheon Workers Health Center
Journal of Occupational Health | Year: 2015

Is suicidal ideation linked to working hours and shift work in Korea? : Chang-Gyo YOON, et al. Department of Preventive Medicine, Armed Forces Medical Command, Republic of Korea-Objective: This study attempted to use the community health survey (CHS) to identify the effect of long working hours (long WHs) and night/shift work on suicidal ideation among the employed population of Korea. Methods: This study used data from 67,471 subjects who were administered the 2008 CHS which obtained information regarding sociodemographic characteristics, health behaviors and working environment, using structured questionnaires and personal interviews. We adopted multiple logistic regression models for gender and employment stratification. Results: Among male employees, suicidal ideation was significantly associated with only moderately long WHs (51-60 hours), after controlling covariates (adjusted odds ratio [aOR], 1.30; 95% confidence interval [95%CI], 1.07 to 1.57). Self-employed/male employer populations had higher suicidal ideation when they had moderately long WHs (aOR, 1.23; 95%CI, 1.01 to 1.50) and very long WHs (over 60 hours) (aOR, 1.31; 95%CI, 1.08 to 1.59). Among the female population, suicidal ideation was significantly association with moderately long WHs in the employee group (aOR, 1.31; 95%CI, 1.08 to 1.58) and moderately (aOR, 1.35; 95%CI, 1.08 to 1.69) and very (aOR, 1.33; 95%CI, 1.07 to 1.65) long WHs in the self-employed/employer group. Shift work was a significant predictor only in the female population in the employee groups (aOR, 1.45; 95%CI, 1.23 to 1.70). Conclusions: Long WHs and shift work were associated with suicidal ideation when taking into account gender and employment differences. The harmful effects of exceptionally long WHs in Korea, among other Organization for Economic Co-operation and Development (OECD) countries, raise concerns about public and occupational health. To address the issue of long WHs, labor policies that reduce maximum working hours and facilitate job stability are needed.


Yoon J.-H.,Yonsei University | Yoon J.-H.,Incheon Workers Health Center | Jung P.K.,Yonsei University | Roh J.,Yonsei University | And 4 more authors.
PLoS ONE | Year: 2015

Background Long working hours are a worldwide problem and may increase the risk of various health issues. However, the health effects of long working hours on suicidal thoughts have not been frequently studied. Our goal was to investigate the relationship between long working hours and suicidal thoughts in the rapidly developing country of Korea. Methods Data from 12,076 participants (7,164 men, 4,912 women) from the 4th and 5th Korean National Health and Nutrition Examination Surveys were used for the current analysis. Multivariate logistic regression models were used to estimate odds ratios and 95% confidence intervals for suicidal thoughts. Combined effects of long working hours and lower socioeconomic status or sleep disturbance were also estimated. Results Compared to groups who worked less than 52 hours per week, odds ratios (95% confidence intervals) for suicidal thoughts in groups who worked 60 hours or more per week were 1.36 (1.09-1.70) for males and 1.38 (1.11-1.72) for females, even after controlling for household income, marital status, history of hypertension or diabetes mellitus, health-related behaviors, and past two weeks' experience of injury, intoxication, or acute or chronic diseases, as well as type of work. The combined effects of long working hours with lower socioeconomic status, or with sleep disturbance, were also significantly higher compared to participants who worked less than 52 hours per week with higher socioeconomic status, or with 6-8 hours of nighttime sleep. Conclusion In this study, long working hours were linked to suicidal thoughts for both genders. Additionally, the odds of those suicidal thoughts were higher for lower socioeconomic groups. To prevent adverse psychological health problems such as suicidal thoughts, a strategy regarding long working hours should be investigated. © 2015 Yoon et al.


Kang M.-Y.,Occupational Safety and Health Research Institute | Kang M.-Y.,Seoul National University | Kang Y.-J.,Occupational Safety and Health Research Institute | Lee W.,Center for Infectious Disease Control | And 2 more authors.
Journal of Occupational Health | Year: 2016

Objectives: Our prospective study aimed toelucidate the effect of long-term experience of nonstandardemployment status on the incidence of depressionin elderly population using the Korean Longitudinal Studyof Ageing (KLoSA) study. Methods: This study used thefirst- to fourth-wave cohorts of KLoSA. After the exclusionof the unemployed and participants who experienceda change in employment status during the followupperiods, we analyzed a total of 1,817 participants.Employment contracts were assessed by self-reportedquestions: standard or nonstandard employment. Theshort form of the Center for Epidemiologic Studies DepressionScale (CES-D) served as the outcome measure.Hazard ratios (HRs) with 95% confidence intervals(CIs ) were calculated using Cox proportional hazardsmodels to evaluate the association between standard/nonstandard employees and development of depression.Results: The mean age of the participants was 53.90 (±7.21) years. We observed that nonstandard employmentsignificantly increased the risk of depression. Comparedwith standard employees, nonstandard employees had a1.5-fold elevated risk for depression after adjusting forage, gender, CES-D score at baseline, household income,occupation category, current marital status, numberof living siblings, perceived health status, and chronicdiseases [HR=1.461, 95% CI=(1.184, 1.805)]. Moreover,regardless of other individual characteristics, the elevatedrisk of depression was observed among all kindsof nonstandard workers, such as temporary and dayworkers, full-time and part-time workers, and directly employedand dispatched labor. Conclusions: The 6-yearfollow-up study revealed that long-term experience ofnonstandard employment status increased the risk of depressionin elderly population in Korea.


Seok H.,Yonsei University | Yoon J.-H.,Yonsei University | Won J.-U.,Yonsei University | Won J.-U.,Incheon Workers Health Center | And 5 more authors.
Tohoku Journal of Experimental Medicine | Year: 2015

Concealing emotions at work can cause considerable psychological stress. While there is extensive research on the adverse health effects of concealing emotions and the association between allergic diseases and stress, research has not yet investigated whether concealing emotions at work is associated with allergic rhinitis. Allergic rhinitis is a common disease in many industrialized countries, and its prevalence is increasing. Thus, our aim was to determine the strength of this association using data from three years (2007-2009) of the 4th Korean National Health and Nutrition Examination Survey. Participants (aged 20-64) were 8,345 individuals who were economically active and who had completed the questionnaire items on concealing emotions at work. Odds ratio (OR) and 95% confidence intervals (95%CIs) were calculated for allergic rhinitis using logistic regression models. Among all participants, 3,140 subjects (37.6%) reported concealing their emotions at work: 1,661 men and 1,479 women. The OR (95%CIs) for allergic rhinitis among those who concealed emotions at work versus those who did not was 1.318 (1.148-1.512). Stratified by sex, the OR (95% CIs) was 1.307 (1.078-1.585) among men and 1.346 (1.105-1.639) among women. Thus, individuals who concealed their emotions at work were significantly more likely to have a diagnosis of AR in comparison to those who did not. Because concealing emotions at workhas adverse health effects, labor policies that aim to reduce this practice are needed. © 2016 Tohoku University Medical Press.


Lee W.,Yonsei University | Lee W.,Incheon Workers Health Center | Lim S.-S.,Yeongdong Goon Health Center | Won J.-U.,Yonsei University | And 8 more authors.
Sleep Medicine | Year: 2015

Objective: The aim of the present study was to investigate the association between sleep duration and dry eye syndrome (DES) symptoms. Methods: We investigated 15,878 subjects (male = 6684; female = 9194) aged 20 years and older who underwent physical examinations and completed a self-report questionnaire and other anthropometric variables from the fifth Korean National Health and Nutrition Examination Survey (KNHANES) 2010-2012. Odds ratios (OR) and 95% confidence intervals (95% CI) for DES according to sleep duration were calculated using multiple logistic regression models. Results: Compared to that in an optimal sleep group (6-8 h/day), OR (95% CI) DES prevalence after adjusting for age, gender, sociodemographic factors (educational level, occupation, household income, and residence), and health behaviors (smoking habit, alcohol consumption, and level of exercise) was 1.20 (1.05-1.36) for a mild short sleep group (5 h/day) and 1.29 (1.08-1.55) for a severe short sleep group (≤4 h/day). Conclusion: Our results revealed that DES increased at shorter sleep durations. © 2015 Elsevier B.V..


Seok H.,Yonsei University | Yoon J.-H.,Yonsei University | Yoon J.-H.,Incheon Workers Health Center | Lee W.,Yonsei University | And 6 more authors.
Journal of Korean Medical Science | Year: 2016

We aimed to examine whether there is a correlation between the health recovery of industrial accident victims and their perceived socioeconomic status. Data were obtained from the first Panel Study of Worker's Compensation Insurance, which included 2,000 participants. We performed multivariate regression analysis and determined the odds ratios for participants with a subjectively lower socioeconomic status and for those with a subjectively lower middle socioeconomic status using 95% confidence intervals. An additional multivariate regression analysis yielded the odds ratios for participants with a subjectively lower socioeconomic status and those with a subjectively upper middle socioeconomic class using 95% confidence intervals. Of all participants, 299 reported a full recovery, whereas 1,701 did not. We examined the odds ratio (95% confidence intervals) for participants' health recovery according to their subjective socioeconomic status while controlling for sex, age, education, tobacco use, alcohol use, subjective state of health prior to the accident, chronic disease, employment duration, recovery period, accident type, disability status, disability rating, and economic participation. The odds of recovery in participants with a subjectively lower middle socioeconomic status were 1.707 times greater (1.264-2.305) than that of those with a subjectively lower socioeconomic status. Similarly, the odds of recovery in participants with a subjectively upper middle socioeconomic status were 3.124 times greater (1.795-5.438) than that of those with a subjectively lower socioeconomic status. Our findings indicate that participants' perceived socioeconomic disparities extend to disparities in their health status. The reinforcement of welfare measures is greatly needed to temper these disparities. ©2016 The Korean Academy of Medical Sciences.

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