Annals of Occupational and Environmental Medicine

Volume 30; 2018

Research Article

The association between shift work and chronic kidney disease in manual labor workers using data from the Korea National Health and Nutrition Examination Survey (KNHANES 2011–2014): Jun Young Uhm, Hyoung-Ryoul Kim, Gu Hyeok Kang, Young Gon Choi, Tae Hwi Park, Soo Young Kim, Seong Sil Chang, Won Oh Choo; Ann Occup Environ Med 2018;30:69. Published online December 14, 2018; DOI: https://doi.org/10.1186/s40557-018-0279-z

Objective

Kidneys are organs having a biological clock, and it is well known that the disruption of the circadian rhythm increases the risk of chronic kidney disease (CKD), including the decline of renal and proteinuria. Because shift work causes circadian disruption, it can directly or indirectly affect the incidence of chronic kidney disease. Therefore, the purpose of this study was to investigate the association between shift work and chronic kidney disease using a Korean representative survey dataset.

Methods

This study was comprised of 3504 manual labor workers over 20 years of age from data from the fifth and sixth Korea National Health and Nutrition Examination Survey (2011–2014). The work schedules were classified into two types: day work and shift work. The estimated glomerular filtration rate, which is the ideal marker of renal function, was estimated according to the Chronic Kidney Disease Epidemiology Collaboration creatinine equation, and chronic kidney disease was defined as urinary albumin to a creatinine ratio equal to or high than 30 mg/g and/or estimated glomerular filtration rate lower than 60 mL/min/1.73 m². The cross-tabulation analysis and multivariate logistic regression analysis were performed to confirm the association between shift work and chronic kidney disease stratified by gender.

Results

The risk of CKD showed a significant increase (odds ratio = 2.04, 95% confidence interval = 1.22, 3.41) in the female worker group. The same results were obtained after all confounding variables were adjusted (odds ratio = 2.34, 95% confidence interval = 1.35, 4.07). However, the results of the male worker group were not significant.

Conclusions

In this study using nationally representative surveys, we found that the risk of CKD was higher female workers and shift work. Future prospective cohort studies will be needed to clarify the causal relationship between shift work and CKD.

Citations

Citations to this article as recorded by

Multimorbidity and its Associated Factors in Korean Shift Workers: Population-Based Cross-Sectional Study
Hye Chong Hong, Young Man Kim
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Circadian light/dark cycle reversal exacerbates the progression of chronic kidney disease in mice
Jiayang Zhang, Lejia Qiu, Zhaiyi Liu, Jiaxin Liu, Bo Yu, Chengcheng Liu, Baoyin Ren, Jiaqi Zhang, Shuyao Li, Youfei Guan, Feng Zheng, Guangrui Yang, Lihong Chen
Journal of Pineal Research.2024;[Epub] CrossRef
Effect of night shift work on the reduction of glomerular filtration rate using data from Korea Medical Institute (2016-2020)
Beom Seok Ko, Sang Yop Shin, Ji Eun Hong, Sungbeom Kim, Jihhyeon Yi, Jeongbae Rhie
Annals of Occupational and Environmental Medicine.2023;[Epub] CrossRef
Association between social jetlag and chronic kidney disease among the Korean working population
Seong-Sik Cho, Byung Ha Chung, Hye-Eun Lee, Mo-Yeol Kang
Scientific Reports.2023;[Epub] CrossRef
Toward Precision Medicine: Circadian Rhythm of Blood Pressure and Chronotherapy for Hypertension - 2021 NHLBI Workshop Report
Michelle L. Gumz, Daichi Shimbo, Marwah Abdalla, Ravi C. Balijepalli, Christian Benedict, Yabing Chen, David J. Earnest, Karen L. Gamble, Scott R. Garrison, Ming C. Gong, John B. Hogenesch, Yuling Hong, Jessica R. Ivy, Bina Joe, Aaron D. Laposky, Mingyu L
Hypertension.2023; 80(3): 503. CrossRef
Circadian Disruption and the Molecular Clock in Atherosclerosis and Hypertension
Hannah M. Costello, Ravindra K. Sharma, Annalisse R. McKee, Michelle L. Gumz
Canadian Journal of Cardiology.2023; 39(12): 1757. CrossRef
Peripheral blood lipid and liver and kidney function test results in long-term night shift nurses: a cross-sectional study in South China
Yang Zhao, Xunhao Lu, Yanghua Wang, Yiyi Cheng, Qiao He, Rongqi Qin, Wenrui Li, Haizhou Liu, Yuanfang Liu
Frontiers in Endocrinology.2023;[Epub] CrossRef
Chronic Kidney Disease Among Agricultural Workers in Taiwan: A Nationwide Population-Based Study
Che-Jui Chang, Hsiao-Yu Yang
Kidney International Reports.2023; 8(12): 2677. CrossRef
Risky working conditions and chronic kidney disease
Rui Lan, Yao Qin, Xiangjun Chen, Jinbo Hu, Wenjin Luo, Yan Shen, Xue Li, Lina Mao, Hanwen Ye, Zhihong Wang
Journal of Occupational Medicine and Toxicology.2023;[Epub] CrossRef
Association and pathways between shift work and cardiovascular disease: a prospective cohort study of 238 661 participants from UK Biobank
Frederick K Ho, Carlos Celis-Morales, Stuart R Gray, Evangelia Demou, Daniel Mackay, Paul Welsh, S Vittal Katikireddi, Naveed Sattar, Jill P Pell
International Journal of Epidemiology.2022; 51(2): 579. CrossRef
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Ciaran J. McMullan, Andrew W. McHill, Joseph T. Hull, Wei Wang, John P. Forman, Elizabeth B. Klerman
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Xu Han, Fei Wang, Jing Wang, Meian He
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Ki Duk Kim, Suk-Yong Jang
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Lin Xing, Shanyu Wu, Ying Shi, Fangzhi Yue, Lin Wei, Ryan Russell, Dongmei Zhang
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Circadian rhythms and renal pathophysiology
Rajesh Mohandas, Lauren G. Douma, Yogesh Scindia, Michelle L. Gumz
Journal of Clinical Investigation.2022;[Epub] CrossRef
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Long work hours and decreased glomerular filtration rate in the Korean working population
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Impact of Circadian Disruption on Cardiovascular Function and Disease
Sarah L. Chellappa, Nina Vujovic, Jonathan S. Williams, Frank A.J.L. Scheer
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Correction

Correction to: The effect of a blue enriched white light on salivary antioxidant capacity and melatonin among night shift workers: a field study: Reza Kazemi, Rasoul Hemmatjo, Hamidreza Mokarami; Ann Occup Environ Med 2018;30:68. Published online December 13, 2018; DOI: https://doi.org/10.1186/s40557-018-0280-6

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Research Article

The association between long working hours and work-related musculoskeletal symptoms of Korean wage workers: data from the fourth Korean working conditions survey (a cross-sectional study): Jae-Gwang Lee, Guang Hwi Kim, Sung Won Jung, Sang Woo Kim, June-Hee Lee, Kyung-Jae Lee; Ann Occup Environ Med 2018;30:67. Published online December 3, 2018; DOI: https://doi.org/10.1186/s40557-018-0278-0

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Background

It has been reported that long working hours are hazardous to the workers’ health. Especially, work-related musculoskeletal disorders (WMSDs) have been considered as one of the significant health issues in workplace. The objective of this study was to identify the association between long working hours and work-related musculoskeletal symptoms.

Methods

The analysis was conducted using data from the Fourth Korean Working Conditions Survey (KWCS). Subjects of this study were 24,783 wage workers and divided into three groups according to the weekly working hours, which were ≤ 40, 41–52 and > 52 h. The relationship between long working hours and work-related musculoskeletal symptoms was analyzed by multivariate logistic regression method after adjusting for general, occupational characteristics including specific working motions or postures and psychosocial factors.

Results

Approximately 18.4% of subjects worked more than 52 h per week and 26.4 and 16.4% of male subjects and 33.0 and 23.4% of female subjects experienced work-related upper and lower limb pains, respectively, over the last 12 months. Moreover, the prevalence of upper and lower limb pain was increased in both genders as the weekly working hours increased. The odds ratios (ORs) of upper limb pain for those working 41–52 h and more than 52 h per week when adjusted for general, occupational characteristics including specific motions or postures and psychosocial factors were 1.36 and 1.40 for male workers and 1.26 and 1.66 for female workers compared to the reference group, respectively. Furthermore, ORs of lower limb pain for the same weekly working hour groups were 1.26 and 1.47 for male workers and 1.20 and 1.47 for female workers, respectively.

Conclusions

Long working hours were significantly related to work-related musculoskeletal symptoms in Korean wage workers and appropriate interventions should be implemented to reduce long working hours that can negatively affect workers’ health.

Citations

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Research Article

Changes of hemodynamic and cerebral oxygenation after exercise in normobaric and hypobaric hypoxia: associations with acute mountain sickness: Tobias Kammerer, Valentina Faihs, Nikolai Hulde, Andreas Bayer, Max Hübner, Florian Brettner, Walter Karlen, Julia Maria Kröpfl, Markus Rehm, Christina Spengler, Simon Thomas Schäfer; Ann Occup Environ Med 2018;30:66. Published online November 19, 2018; DOI: https://doi.org/10.1186/s40557-018-0276-2

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Objective

Normobaric (NH) and hypobaric hypoxia (HH) are associated with acute mountain sickness (AMS) and cognitive dysfunction. Only few variables, like heart-rate-variability, are correlated with AMS. However, prediction of AMS remains difficult. We therefore designed an expedition-study with healthy volunteers in NH/HH to investigate additional non-invasive hemodynamic variables associated with AMS.

Methods

Eleven healthy subjects were examined in NH (FiO₂ 13.1%; equivalent of 3.883 m a.s.l; duration 4 h) and HH (3.883 m a.s.l.; duration 24 h) before and after an exercise of 120 min. Changes in parameters of electrical cardiometry (cardiac index (CI), left-ventricular ejection time (LVET), stroke volume (SV), index of contractility (ICON)), near-infrared spectroscopy (cerebral oxygenation, rScO₂), Lake-Louise-Score (LLS) and cognitive function tests were assessed. One-Way-ANOVA, Wilcoxon matched-pairs test, Spearman’s-correlation-analysis and Student’s t-test were performed.

Results

HH increased heart rate (HR), mean arterial pressure (MAP) and CI and decreased LVET, SV and ICON, whereas NH increased HR and decreased LVET. In both NH and HH cerebral oxygenation decreased and LLS increased significantly. After 24 h in HH, 6 of 11 subjects (54.6%) developed AMS. LLS remained increased until 24 h in HH, whereas cognitive function remained unaltered. In HH, HR and LLS were inversely correlated (r = − 0.692; p < 0.05). More importantly, the rScO2-decrease after exercise in NH significantly correlated with LLS after 24 h in HH (r = − 0.971; p < 0.01) and rScO2 correlated significantly with HR (r = 0.802; p < 0.01), CI (r = 0.682; p < 0.05) and SV (r = 0.709; p < 0.05) after exercise in HH.

Conclusions

Both acute NH and HH altered hemodynamic and cerebral oxygenation and induced AMS. Subjects, who adapted their CI had higher rScO2 and lower LLS. Furthermore, rScO2 after exercise under normobaric conditions was associated with AMS at high altitudes.

Citations

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Acute Exercise in Hypobaric Hypoxia Attenuates Endothelial Shedding in Subjects Unacclimatized to High Altitudes
Julia M. Kröpfl, Tobias Kammerer, Valentina Faihs, Hans-Jürgen Gruber, Jan Stutz, Markus Rehm, Ingeborg Stelzer, Simon T. Schäfer, Christina M. Spengler
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Hypoxic-Inflammatory Responses under Acute Hypoxia: In Vitro Experiments and Prospective Observational Expedition Trial
Tobias Kammerer, Valentina Faihs, Nikolai Hulde, Manfred Stangl, Florian Brettner, Markus Rehm, Mareike Horstmann, Julia Kröpfl, Christina Spengler, Simone Kreth, Simon Schäfer
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Case Report

Ovarian cancer in a former asbestos textile factory worker: a case report: Sunwook Park, Jaechan Park, Eunsoo Lee, Huisu Eom, Mu Young Shin, Jungwon Kim, Dongmug Kang, Sanggil Lee; Ann Occup Environ Med 2018;30:65. Published online November 16, 2018; DOI: https://doi.org/10.1186/s40557-018-0277-1

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Background

The International Agency for Research on Cancer (IARC) defined that asbestos is a group 1 substance that causes lung cancer, mesothelioma (pleura and peritoneum), laryngeal cancer, and ovarian cancer in humans. Many studies on lung cancer, and mesothelioma caused by asbestos exposure have been conducted, but there was no case report of ovarian cancer due to asbestos exposure in Korea. We describe a case of ovarian cancer caused by asbestos exposure in a worker who worked at an asbestos textile factory for 3 years and 7 months in the late 1970s.

Case presentation

A 57-year-old woman visited the hospital because she had difficulty urinating. Ovarian cancer was suspected in radiologic examination, and exploratory laparotomy was performed. She was diagnosed with epithelial ovarian cancer. The patient did not undergo postoperative chemotherapy and recovered. She joined the asbestos factory in March 1976 and engaged in asbestos textile twisting and spinning for 1 year, 2 years and 7 months respectively. In addition, she lived near the asbestos factory for more than 20 years. There was no other specificity or family history.

Conclusion

Considering the patient’s occupational and environmental history, it is estimated that she had been exposed to asbestos significantly, so we determined that ovarian cancer in the patient is highly correlated with the occupational exposure of asbestos and environmental exposure is a possible cause as well. Social devices are needed to prevent further exposure to asbestos. It is also necessary to recognize that ovarian cancer can occur in workers who have previously been exposed to asbestos, and the education and social compensation for those workers are needed.

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Wasey Ali Yadullahi Mir, Ayusha Poudel, Anurag Adhikari, Dhan Bahadur Shrestha, Yubraj Sedhai, Peter LaCamera, Andrew Moraco
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Primary Ovarian Mesothelioma: A Case Series with Electron Microscopy Examination and Review of the Literature
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Research Article

Occupational cancer claims in Korea from 2010 to 2016: Kyungjoon Lee, Sujin Lee, Jeehee Min, Inah Kim; Ann Occup Environ Med 2018;30:64. Published online November 1, 2018; DOI: https://doi.org/10.1186/s40557-018-0272-6

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Background

Research on carcinogens causing occupational cancer has been updated. Further, social interest in occupational cancer has increased. In addition, the standard for recognizing cancer as a work-related disease has also been revised. The present study aims to describe the distribution of occupational cancer claims or its approval rate and their association with work-related variables.

Methods

We analyzed 1299 claim cases for occupational cancer from 2010 to 2016 provided by the Korea Workers’ Compensation and Welfare Service (KCOMWEL). The status of approval rate was shown by year, sex, industry, occupation, age of diagnosis, duration from employment to diagnosis, and cancer site.

Results

The approval rate was 39.0% from 2010 to 2016 and tended to increase annually since 2011. Both the number of claims and the approval rate were higher in men. Mining and quarrying showed the highest approval rate (78.4%). The approval rates by age of diagnosis and duration from employment to diagnosis increased as the time periods increased. Respiratory organ had the highest number of claims and the highest approval rate by cancer site.

Conclusions

The approval rate of occupational cancer has shown an increasing trend since 2011. The increase of occupational carcinogens and cancer sites and the improvement of social awareness about occupational cancer could have resulted in this trend. The present study provides unique, and the latest and most accurate findings on occupational cancer data of recent 7 years that could be helpful to researchers or policy makers on occupational cancer.

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Case-Control Study of Occupational Acute Myeloid Leukemia in the Republic of Korea
Min Young Park, Hyoung-Ryoul Kim, Jun-Pyo Myong, Byung-Sik Cho, Hee-Je Kim, Mo-Yeol Kang
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Status and prediction of disapproval of the Korean workers’ compensation insurance for diseases and injuries
Soo Beom Choi, Seunghyun Lee, Wanhyung Lee
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Eui Yup Chung, Young Hoo Shin, Young Wook Kim, Jun Seok Son, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Seung Hyun Park, Sung Joon Woo, Chang Ho Chae
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Rena Kaneko, Masayoshi Zaitsu, Yuzuru Sato, Yasuki Kobayashi
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Research Article

Factors related with quality on sleep of daytime workers: Bu-il Kim, Seong-yong Yoon, Jin-seok Kim, Kuck-Hyeun Woo, Seong-yong Cho, Ho Lee, Jong-min An; Ann Occup Environ Med 2018;30:63. Published online October 23, 2018; DOI: https://doi.org/10.1186/s40557-018-0271-7

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Background

This study was conducted to identify the sleep status of daytime workers who do not work in shifts. This study analyzed factors affecting sleep duration and sleep quality.

Methods

This study was conducted on 1171 daytime workers at a manufacturing workshop. We used a self-administered questionnaire to investigate demographic variables, work type, working period, musculoskeletal symptoms and the Pittsburgh Sleep Quality Index to assess sleep. Regular health checkup was conducted for the worker’s clinical examination.

Results

The mean sleep duration was 6.36 h and the mean score on the Pittsburgh Sleep Quality Index was 4.46. Work type and obesity were related to sleep duration. Age, obesity and musculoskeletal pain were significantly related to sleep quality. The prevalence ratio of researcher group for short sleep duration was 1.27 (95% confidence interval: 1.02–1.58). The prevalence ratio of those aged 50 years and over was 0.47 (0.25–0.91) and of those in their 40s was 0.56 (0.35–0.91) for poor sleep quality compared to those in their 20s. The prevalence ratio of the obesity group for poor sleep quality was 1.53 (1.10–2.12). The prevalence ratio of musculoskeletal pain group for poor sleep quality was 1.92 (1.29–2.84).

Conclusions

Age, obesity and musculoskeletal pain were factors affecting the poor quality on sleep of daytime workers. In addition, work type related to short sleep duration.

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Vergílio Pereira Carvalho, Kênia Alves Barcelos, Ely Paula de Oliveira, Sarah Nogueira Marins, Isabella Beatriz Silva Rocha, Daniel Ferreira Moraes de Sousa, Bruno Cabral Moreira, Gunther Abreu de Almeida, Marina Luana Silva Carneiro, Jéssica Duarte de Fr
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Research Article

Relationship between job stress and functional dyspepsia in display manufacturing sector workers: a cross-sectional study: Younghyeon Nam, Soon-Chan Kwon, Yong-Jin Lee, Eun-Chul Jang, Seung-hwan Ahn; Ann Occup Environ Med 2018;30:62. Published online October 19, 2018; DOI: https://doi.org/10.1186/s40557-018-0274-4

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Background

Job stress has been reported as a risk factor of psychological changes, which have been shown to be related to gastrointestinal diseases and symptoms such as functional dyspepsia. However, few studies have assessed the relationship between job stress and functional dyspepsia. Therefore, we investigated the relationship between job stress and functional dyspepsia in South Korea.

Methods

This study was conducted between May 23 and July 6, 2016 and included 901 workers in the display manufacturing sector. Subjects completed self-reported questionnaires, regarding Korean Occupational Stress Scale (KOSS), functional dyspepsia, Insomnia Severity Index-K, and health-related behaviors and job characteristics. Subjects were divided into functional dyspepsia-positive and -negative groups based on the Rome III criteria. The KOSS high-risk group was defined as subjects with KOSS score above the 75 percentile of KOSS reference value. Multiple logistic regression analysis was performed to investigate the association between job stress and functional dyspepsia.

Results

In women, the risk of functional dyspepsia was significantly higher in the high-risk groups of the following KOSS subcategories in unadjusted model: job demand (OR 3.282, 95% CI 1.181–9.126), and occupational climate (OR 2.665, 95% CI 1.041–6.823). Even in adjusted model, the risk was significantly higher in the high-risk groups of the following KOSS subcategories: job demand (OR 3.123, 95% CI 1.036–9.416) and occupational climate (OR 3.304, 95% CI 1.198–9.115). In men, the risk of functional dyspepsia was not significant in all KOSS subcategories.

Conclusions

This study showed that job demand and occupational climates were associated with functional dyspepsia in female display manufacturing sector workers. Therefore, both clinical and mental health approaches should be used in the management of functional dyspepsia in women.

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Research Article

The effect of a blue enriched white light on salivary antioxidant capacity and melatonin among night shift workers: a field study: Reza Kazemi, Rasoul Hemmatjo, Mokarami Hamidreza; Ann Occup Environ Med 2018;30:61. Published online October 19, 2018; DOI: https://doi.org/10.1186/s40557-018-0275-3

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Background

Because of their positive impact on individuals’ performance and alertness, blue enriched white light sources are gaining popularity in households and industries. However, these sources of blue light spectrum may cause oxidative stress. On the other hand, there are no empirical studies investigating the negative effect of blue enriched white light on oxidative stress. Thus, the current study aimed at empirical assessment of the effect of such light sources on oxidative stress among night shift workers.

Methods

The study, which adopted a cross-sectional design, focused on 30 control room operators of a petrochemical complex. The subjects followed a shift-work schedule comprising 7 night shifts, 7 day shifts, and 7 days off. The subjects were exposed to 6500 K, 3000 K, and 17,000 K light sources (which have various degrees of blue light) during three consecutive work cycles, with each cycle lasting for 7 nights. In each light condition, three salivary measurements were conducted (at the beginning, in the middle, and at the end of the shift). The measurements were used to assess catalase (CAT), total thiol molecules (TTG), and total antioxidant capacity (TAC), and melatonin.

Results

The results of repeated measures ANOVA showed that there was no significant difference among various light conditions with regard to salivary biomarkers (catalase, total thiol molecules, and total antioxidant capacity). There was however a significant difference between 3000 K and 17,000 K conditions with regard to the concentration of salivary melatonin (p = 0.001).

Conclusion

Given that there was no significant difference among various light conditions in terms of biomarkers, it is concluded that using sources of light with high color temperature can be recommended. Nonetheless, because of the limitations of the present study (e.g. short period of intervention), it is suggested that care should be exercised in using such light sources.

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Chrono-modulated effects of external stressors on oxidative stress and damage in humans: A scoping review on night shift work
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Blue-Enriched White Light Improves Performance but Not Subjective Alertness and Circadian Adaptation During Three Consecutive Simulated Night Shifts
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Correction to: The effect of a blue enriched white light on salivary antioxidant capacity and melatonin among night shift workers: a field study
Reza Kazemi, Rasoul Hemmatjo, Hamidreza Mokarami
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Research Article

Association between air pollution in the 2015 winter in South Korea and population size, car emissions, industrial activity, and fossil-fuel power plants: an ecological study: Hyeran Choi, Jun-Pyo Myong; Ann Occup Environ Med 2018;30:60. Published online October 5, 2018; DOI: https://doi.org/10.1186/s40557-018-0273-5

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Background

Compared to 10 years ago, the ambient particulate matter 10 (PM₁₀) and carbon monoxide (CO) levels in South Korea have decreased. However, compared to many other OECD countries, these levels are still too high. Concentration of air pollutants such as PM₁₀ is especially higher during winter than during summer. The first step to rationally solving the air pollution problem in Korea is to identify the key air pollution sources during each season. This ecological study was performed to assess the association between the number of days the accepted PM₁₀ and CO thresholds were exceeded and the concentration of potential emission sources in winter season 2015.

Methods

An emission inventory of the PM₁₀ and CO emissions in the 232 administrative South Korean districts in January, 2015, and February, 2015 and December, 2015, and the population density, number of car registrations, number of car accidents, industrial power usage, and presence of a fossil-fuel power plant in each district was established on the basis of official web-page data from the government. For all emission source variables except power plants, the administrative districts were grouped into quartiles. Districts were also divided according to whether a power plant was present or not. Negative binomial regression was performed to assess the associations between the PM₁₀ and CO air pollution (defined as ≥100 g/m³ and ≥ 9 ppm, respectively) and the concentration of each emission source.

Results

Compared to the districts with the lowest population density, the districts with the third highest population density associated most strongly with air pollution. This was also observed for industrial power usage. Car accident number and car registration numbers showed a linear relationship with air pollution. Districts with power plants were significantly more likely to have air pollution than districts that lacked a plant.

Conclusions

Greater car numbers, industrial activity, and population density, and the presence of fossil-fuel plants associated with air pollution in the 2015 winter in South Korea. These data highlight the contaminant sources that could be targeted by interventions that aim to reduce air pollution, decrease the incidence of exposure, and limit the impact of pollution on human health.

Electronic supplementary material

The online version of this article (10.1186/s40557-018-0273-5) contains supplementary material, which is available to authorized users.

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Case Report

Acute radiation syndrome in a non-destructive testing worker: a case report: Ji-Sung Ahn, Jai-Dong Moon, Wonyang Kang, Hyeong-Min Lim, Seunghyeon Cho, Dae-Young Lim, Won-Ju Park; Ann Occup Environ Med 2018;30:59. Published online September 25, 2018; DOI: https://doi.org/10.1186/s40557-018-0270-8

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Background

In Korea, there were repeated radiation exposure accidents among non-destructive testing workers. Most of the cases involved local injury, such as radiation burns or hematopoietic cancer. Herein, we report a case of acute radiation syndrome caused by short periods of high exposure to ionizing radiation.

Case presentation

In January 2017, Korea Information System on Occupational Exposure (KISOE) found that a 31-year-old man who had worked in a non-destructive testing company had been overexposed to radiation. The patient complained of symptoms of anorexia, general weakness, prostration, and mild dizziness for several days. He was anemic. The venous injection areas had bruises and bleeding tendency. Blood and bone marrow testing showed pancytopenia and the patient was diagnosed with acute radiation syndrome (white blood cells: 1400/cubic mm, hemoglobin: 7.1 g/dL, platelets: 14000/cubic mm). He was immediately prohibited from working and blood transfusion was commenced. The patient’s radiation exposure dose was over 1.4 Gy (95% confidence limits: 1.1–1.6) in lymphocyte depletion kinetics. It was revealed that the patient had been performing non-destructive tests without radiation shielding when working in high places of the large pipe surface.

Conclusions

Exposure prevention is clearly possible in radiation-exposed workers. Strict legal amendments to safety procedures are essential to prevent repeated radiation exposure accidents.

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Research Article

Relationship between simultaneous exposure to ergonomic risk factors and work-related lower back pain: a cross-sectional study based on the fourth Korean working conditions survey: Jae-Yeop Kim, Ji-Su Shin, Myeong-Seob Lim, Hyeon-Gyeong Choi, Sung-Kyeong Kim, Hee-Tae Kang, Sang-Baek Koh, Sung-Soo Oh; Ann Occup Environ Med 2018;30:58. Published online September 5, 2018; DOI: https://doi.org/10.1186/s40557-018-0269-1

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Background

It is well known that ergonomic risk factors and back pain are related. However, few studies have examined the relationship between simultaneous exposure to these risk factors and back pain in a Korean population. We aimed to investigate the relationship between simultaneous exposure to ergonomic risk factors and work-related lower back pain (LBP) based on the fourth Korean Working Conditions Survey (KWCS).

Method

The fourth KWCS (2014) was used for this study. Chi-square tests and logistic regression were used to assess relationship between 5 ergonomic risk factors and work-related LBP. We also analyzed the relationship between simultaneous exposure to 2 risk factors and work-related LBP.

Results

All 5 ergonomic risk factors (fatigue-inducing and painful posture; lifting or moving people; dragging, pushing, or moving heavy objects; standing posture; and repetitive hand or arm movements) were significantly correlated with work-related LBP in the severe exposure group (adjusted odd ratios [aOR] 5.09, 95% confidence interval [CI] 4.46–5.83; aOR 1.98, 95% CI 1.62–2.42; aOR 2.09, 95% CI 1.82–2.40; aOR 1.79, 95% CI 1.60–2.01; aOR 2.04, 95% CI 1.82–2.30, respectively). When exposed to 2 risk factors simultaneously, the relationship between exposure and work-related LBP was not greater than exposure to only 1 risk factor in our study (usually exposed to ‘fatigue-inducing or painful posture’ aOR 2.17, 95% CI 2.02–2.34; high exposure to both ‘fatigue-inducing or painful posture’ and ‘dragging, pushing, or moving heavy objects’ aOR 2.00, 95% CI 1.82–2.20).

Conclusions

There was a strong relationship between severe exposure to each ergonomic risk factor and work-related LBP. However, when exposed to 2 ergonomic risk factors simultaneously, the relationship between exposure and work-related LBP was not stronger than when exposed to only 1 risk factor in our study.

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Research Article

An overview of compensated work-related injuries among Korean firefighters from 2010 to 2015: Hyung Doo Kim, Yon Soo An, Dong Hyun Kim, Kyung Sook Jeong, Yeon Soon Ahn; Ann Occup Environ Med 2018;30:57. Published online September 3, 2018; DOI: https://doi.org/10.1186/s40557-018-0268-2

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Background

Although one in two firefighters in South Korea have experienced work-related injuries, there are few studies which show the overview description on work-related injuries and its analysis regarding such causes. Therefore, we aimed to show the overview of compensated work-related injuries in order to serve fundamental data for establishing prevention policies on work-related injuries for Korean firefighters.

Methods

We requested the all claimed work-related injury data of Korean firefighters from 2010 to 2015 to the Korean National Fire Agency (NFA). The data from NFA including 2457 claimed cases was analyzed and we confirmed, 2154 approved work-related injuries for the kinds of job activities, cause of accident and type of injuries. Among 2154 approved cases, we analyzed more variables for the sex, age, and job duration of 1344 compensated cases through served text file on summary of accident.

Results

The Government Employees Pension Service (GEPS) recognized 2154 (87.7%) approved work-related injuries among 2457 claimed cases. The incidence of work-related injuries per 1000 firefighters was 9.8 persons. By region, the incidence of work-related injuries per 1000 firefighters ranged from a maximum of 14.5 to a minimum of 4.0. The most common job activity caused the accident was fire suppression (18.0%), followed by Emergency medical services (EMS) (17.5%) and training (10.7%). The most common cause of these accident was movement imbalance (30.3%), followed by falls (18.9%) and traffic accident (13.4%). In these work-related injuries, sprains and bruises were the most common type of injury (27.2%), and the most commonly injured body site was the upper and lower back (25.3%). Data from identified 1344 firefighters showed that 1264 (94.0%) were male and 80 (6.0%) were female. Age group was the highest in the 40s with 623 cases (46.4%), and job duration was the highest with 650 cases in 5–10 years (48.4%).

Conclusion

In this study, we could obtain the preliminary data necessary to establish preventive measures, including the cause of accident and region with high accident rates. However, the number of applications for compensated injuries was very small compared to the frequency of injuries found in previous studies. The lack of appropriate treatment suggested that many firefighter injuries can become chronic. In this study, we suggest that it is necessary to introduce an injury monitoring system and improve the accessibility of compensated injuries.

Trial registration

CR318031. Registered 20 June 2018.

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Shifted Firefighter Health Investigation by Personal Health Insurance Record in Taiwan
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Research Article

The effect of increasing the illumination on operators’ visual performance in the control-room of a combined cycle power plant: Seyyed Abolfazl Zakerian, Saeid Yazdanirad, Seifollah Gharib, Kamal Azam, Asma Zare; Ann Occup Environ Med 2018;30:56. Published online August 29, 2018; DOI: https://doi.org/10.1186/s40557-018-0267-3

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Background

Lighting is one of the environmental factors affecting the performance of the control room operators. Therefore, the aim of this study was to compare the control room operators’ visual performance in two different illumination conditions at a combined cycle power plant through field-work.

Methods

Sixteen operators in day shift were evaluated with the Freiburg Visual Acuity test (FrACT) software at two lighting systems with different intensities. It includes the first phase with fluorescent illumination system (Power: 40 W, Color Temperature: 4000 Kelvin, Luminous Flux: 2780 Lumen and Model: Pars Shahab) and the second phase with a combined illumination system includes fluorescent and LED (Power: 48 W, Color Temperature: 4000 Kelvin, Luminous Flux: 5400 Lumen and Model: Mazinoor).

Results

Based on the results, visual performance index and visual acuity significantly increased after the intervention (p < 0.001). As to contrast, more lighting significantly reduced the percentage of recognized contrast (p < 0.001) and increased the contrast performance index (p < 0.001).

Conclusions

The results of this study showed that increasing the intensity of light from the values below the allowable limit to the values above the allowable limit would increase the visual indicators in individuals.

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Research Article

Performance assessment on the Korean Computerized Neurobehavioral Test using a mobile device and a conventional computer: an experimental study: Young Seok Byun, Sung Kyu Park, Joon Sakong, Man Joong Jeon; Ann Occup Environ Med 2018;30:55. Published online August 29, 2018; DOI: https://doi.org/10.1186/s40557-018-0264-6

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Background

The Korean Computerized Neurobehavioral Test (KCNT) is a psychological assessment tool used as part of Workers’ Special Health Examinations in Korea. Due to the spread of mobile technology, this study aimed to compare results of the KCNT administered on a tablet PC versus a desktop computer, and, therefore, assess the clinical applicability of mobile devices.

Methods

A total of 72 participants enrolled in this study. Their age, sex, and years of formal education were collected during an interview, as well as their typing speed. The test battery comprised five subtests: Simple Reaction Time test, Choice Reaction Time test, Digit Addition test, Symbol-Digit Substitution test, and Finger Tapping Speed test. Participants repeated the KCNT test battery in a randomly assigned order using four different testing systems: a desktop computer equipped with a conventional 106-key keyboard (System 1), a desktop computer equipped with a simplified keyboard (System 2), a tablet PC with a simplified 17-key on-screen keyboard (System 3), and a tablet PC equipped with a simplified keyboard (System 4).

Results

Results of the Digit Addition test did not differ significantly for different testing systems. In contrast, results of the Simple Reaction Time test, Choice Reaction Time test, Symbol-Digit Substitution test, and Finger Tapping test were lower for the tablet PC (Systems 3 and 4) compared to the desktop computer (Systems 1 and 2). Systems 1 and 2 did not show significantly different results. Performance on System 3 was inferior to that on System 4, only for the Choice Reaction Time test and Finger Tapping Speed test. There were also significant differences in performance by computer familiarity when adjusted for age and education; however, the performance of each group on the test systems showed similar patterns.

Conclusions

It is not recommended to use a tablet PC to administer the KCNT to evaluate neurobehavioral performance for the Simple Reaction Time test and Choice Reaction Time test; however, tablet PCs with an on-screen keyboard may be used to perform the Digit Addition test, and the Symbol-Digit Substitution test and Finger Tapping Speed test to a limited degree.

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How Do ImPACT Quick Test Scores Compare with ImPACT Online Scores in Non-Concussed Adolescent Athletes?
R J Elbin, Nathan R D’Amico, Matthew McCarthy, Melissa N Womble, Sydne O’Connor, Philip Schatz
Archives of Clinical Neuropsychology.2020; 35(3): 326. CrossRef

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Research Article

Changes of depression and job stress in workers after merger without downsizing: Jun Ick Jung, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Jea Chul Ha; Ann Occup Environ Med 2018;30:54. Published online August 29, 2018; DOI: https://doi.org/10.1186/s40557-018-0266-4

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Background

Since the 1980s, restructuring, which includes downsizing, closures, mergers, and privatization, has expanded worldwide, and various studies have investigated its effect on health. However, previous studies have mainly focused on restructuring accompanied by massive lay-offs, and the effect of a merger on workers’ health is still controversial. This study aims to investigate changes in worker depression and job stress after a merger without downsizing, which is unusual in Korea.

Methods

Repeated surveys were done in April 2014, April 2015, and April 2016 involving the participation of 209 subjects. Participants were divided into two groups, which were comprised of blue-collar workers (104) and white-collar workers (105). Sociodemographic characteristics, including age, education level, job tenure, gender, marital status, smoking status, and alcohol consumption, were measured via a survey. To determine the level of depression, the Korean version of the Center for Epidemiologic Studies Depression Scale (CES-D) was employed, and to investigate job stress, the Korean Occupational Stress Scale-Short Form (KOSS-SF) was used. For statistical analyses, Pearson’s chi-square test, the Student’s t-test, and repeated measure analysis of variance (ANOVA) were performed.

Results

The results showed that depression (CES-D, F[2, 400] = 0.466, p = 0.628) was changed but without significance and job stress (KOSS-SF, F[1.899, 379.831] = 3.192, p = 0.045) were significantly different. The between-group difference in the CES-D score between the blue- and white-collar workers by survey administration time was not statistically significant (F = 0.316, p = 0.574). The interaction between the survey time and occupational group was also not statistically significant (F = 0.967, p = 0.381). The between-group difference in the KOSS-SF total score was not statistically significant (F = 1.132, p = 0.289), and the interaction between the survey administration time and occupational group was also not significant (F = 0.817, p = 0.437). In the job stress subgroup analyses Job insecurity and Lack of reward showed a significant difference by survey administration time.

Conclusion

This study showed that a merger without massive downsizing can cause negative health effects such as an changes in depression and increase in job stress. To improve the health of workers, both the immediate negative effects on health, and the long-term effects or their resolution over time should be considered prior to the merger.

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A Review of Psychological Stress among Students and Its Assessment Using Salivary Biomarkers
Bruno Špiljak, Maja Vilibić, Ana Glavina, Marija Crnković, Ana Šešerko, Liborija Lugović-Mihić
Behavioral Sciences.2022; 12(10): 400. CrossRef

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Research Article

Prevalence and associated factors of intestinal parasitic infections among asymptomatic food handlers working at Haramaya University cafeterias, eastern Ethiopia: Dadi Marami, Konjit Hailu, Moti Tolera; Ann Occup Environ Med 2018;30:53. Published online August 22, 2018; DOI: https://doi.org/10.1186/s40557-018-0263-7

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Background

Intestinal parasitic infections are major public health problems worldwide, with high prevalence in low income countries where substandard food hygiene practices are common. Asymptomatic food handlers with poor personal hygiene could be potential sources of parasitic infections. This study was aimed to assess the prevalence of intestinal parasitic infections and associated factors among asymptomatic food handlers working at Haramaya University cafeterias, eastern Ethiopia.

Methods

A cross-sectional study was conducted among asymptomatic food handlers working at Haramaya University cafeterias from August 2015 to January 2016. Population proportion to size allocation and systematic random sampling techniques were used to identify the study participants. Stool samples were collected and examined simultaneouly using direct and modified formol ether concentration wet smear techniques. Data were entered and analyzed using SPSS version 20.0 software. Logistic regressions were applied to assess association between independent variable and intestinal parasitic infections. Statistical significance was declared at a p-value less than 0.05.

Results

A total of 417 asymptomatic food handlers were enrolled in this study. Of these, females comprised 79.4%. Large proportion (39.3%) of food handlers were in the age group of 31–40 years. The overall prevalence of intestinal parasitic infections was 25.2% (95% CI: 18.3, 29.6). Entamoeba histolytica/ dispar (46.7%) and A. lumbricoides (14.3%) were the most frequent isolates. Having no formal education [AOR: 2.13, 95% CI: 1.24, 3.67], monthly income of less than 45.7 USD [AOR: 3.86, 95% CI: 1.62, 9.20], lack of hand washing after the use of the toilet with soap [AOR: 2.43, 95% CI: 1.22, 4.86] and untrimmed fingernails [AOR: 3.31, 95% CI: 1.99, 5.49] have significant association with intestinal parasitic infections.

Conclusions

The high prevalence of intestinal parasitic infections in this study highlights the importance of food handlers as probable sources of parasitic infections. Public health measures and sanitation programs should be strengthened to control the spread of intestinal parasitic infections.

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Research Article

Psychometric properties of the 10-item Conner-Davidson resilience scale on toxic chemical-exposed workers in South Korea: Gab-Sik Shin, Kyeong-Sook Choi, Kyoung Sook Jeong, Young-Sun Min, Yeon-Soon Ahn, Min-Gi Kim; Ann Occup Environ Med 2018;30:52. Published online August 13, 2018; DOI: https://doi.org/10.1186/s40557-018-0265-5

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Background

Resilient individuals have a comprehensive ability to adapt to various life circumstances. Psychological resilience predicts an individual’s physiological response to stress. The 10-item Connor-Davidson Resilience Scale (CD-RISC) is a widely used measure to quantify the level of self-perceived resilience. This study examined the psychometric properties of a Korean version of the 10-item Connor-Davidson Resilience Scale (10-item K-CD-RISC) on workers in Gumi, South Korea, exposed to hydrofluoric acid (HF).

Methods

The questionnaires included the 10-item K-CD-RISC and Beck Anxiety Inventor (BAI), the Impact of Event Scale-Revised-Korean version (IES-R-K), the Rosen-berg Self Esteem Scale (RSES), the Center for Epidemiologic Studies-Depression Scale (CES-D), and the Perceived Stress Scale (PSS). These were randomly distributed at 237 workplaces near the HF-spill site, in the Gumi 4 complex. The responses of 991 (67.3%) workers were analyzed.

Results

The exploratory factor analysis shown that a single-factor model was consistent with the original design of the 10-item CD-RISC. The scale also demonstrated good internal consistency (Cronbach’s alpha = 0.95). Scores on the scale reflected different levels of resilience with respect to personal factors (age, gender, marital status, and education and income levels) that are thought to be differentiated. Differences of resilience were also reflected by psychiatric symptoms (anxiety and depression). Moreover, the total score of scale positively correlated with RSES, whereas the IES-R-K, BAI, CES-D, and the PSS negatively correlated with the 10-item K-CD-RISC.

Conclusions

The 10-item K-CD-RISC has good psychometric properties and is applicable for victims exposed to noxious chemical such as HF.

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Research Article

Occupational stress among medical residents in educational hospitals: Sedigheh Ebrahimi, Zahra Kargar; Ann Occup Environ Med 2018;30:51. Published online August 8, 2018; DOI: https://doi.org/10.1186/s40557-018-0262-8

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Background

Occupational stress and its related psychological strain is a concern among resident doctors that may affect patient care adversely. Residents face many stresses because of their high job demands in delivery of hospital care. They are often subject to work load and pressure due to direct involvement with patients, prolonged working hours, poor job opportunities and low support. Their multiple educational and clinical roles can also affect their performance and quality of personal or professional life. The aim of this study was to evaluate the occupational stress among residents of various medical specialties.

We aimed to explore the reasons of occupational stress in residents’ life and determine how we can enhance the stress-coping strategies and create more suitable conditions.

Methods

This cross-sectional analytical-descriptive study was conducted on all medical residents with various specialties in Shiraz University of Medical Sciences. Data was collected using Osipow occupational stress questionnaire and analyzed by SPSS software version 17.

Results

The response rate was 88.8%. The average stress score of all residents was 156.35 out of 250. The highest and lowest average stress scores belonged to gynecology and dermatology specialties, respectively. The highest average score of the stress factors was related to the workload with the score of 35.09 of 50 (moderate to severe stress). The total stress score had a significant relationship with age (P = 0.030) and sex (P = 0.009) as well as lack of time to get the needed healthy meals (P = 0.047), high work hours (P < 0.01), surgical specialties (P < 0.01) and on call shift (P < 0.01).

Conclusion

Since most of the stressors were related to the workload, interventions such workload reduction, education about occupational stress and its management, promoting interpersonal relations and more supportive measures are recommended.

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Research Article

The roles of doctors, nurses, and industrial hygienists in the healthcare management services in Korea: a comparison of the opinions of specialized health management institutions and entrusted enterprises: Bo-Young Jang, Dong-Mug Kang, Young-Ki Kim, Se-Young Kim, Kyung-Sun Ko; Ann Occup Environ Med 2018;30:50. Published online August 7, 2018; DOI: https://doi.org/10.1186/s40557-018-0261-9

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Background

This study aimed to identify the difference of perception about the role of appointing health officers by comparing and analyzing the response of entrustment workplace (EW) and specialized health management institution (SI). This is considered an important aspect of an institutional assessment to improve the quality of health management services.

Methods

A survey questionnaire was mailed to 122 SIs and 319 EWs nationwide. The questionnaire survey was about the general characteristics of SIs and EWs and main occupations for each evaluation item. In total, 81 SIs (66.4%) and 30 EWs responded to the questionnaire. A logistic regression analysis was performed to compare the opinions of SI and EW.

Results

Based on the analysis, the items showing statistically significant differences were as follows. Doctors’ main tasks survey: “Guidance on their wearing personal protective equipment (PPE)” (OR: 4.58), “Guidance of improvement of work environment (WE)” (OR: 3.33), etc.; Nurses’ main tasks survey: “Guidance on their wearing PPE” (OR: 3.86), “Guidance for programs on health process in confined space (CS)” (OR: 0.36), “Guidance on the hearing conservation program (HCP)” (OR: 0.28), etc.; Industrial hygienist (IH)‘s main tasks survey: “Guidance of work through inspection (WTI)” (OR: 0.15), “Guidance on the improvement of WE” (OR: 0.32), “Management confirmation of substances used by process and Material Safety Data Sheet (MSDS)” (OR: 0.08), “Guidance on posting or keeping of MSDS and warning signs” (OR: 0.03), “Prevention of dust-induced medical problems” (OR: 0.28), “Guidance for programs of health process in CS” (OR: 0.39), etc.

Conclusions

It is necessary to educate the EWs to recognize the need for physicians to perform tasks, such as wearing a PPE, and instruction to improve WE. As for nurses’ tasks, such as education about the CS and the noise work, educating the nurses of the SI is regarded necessary as the demand of the EWs is considered. With respect to the unique tasks of IH, such as WE management and instructions for wearing PPE, among several other tasks of IH, training should be provided for improved IH recognition.

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Underestimation of smoking hazards and smoking cessation intervention efficiency among healthcare professionals: A cross-sectional study among Korean occupational health nurses
Jihye Lee, Saerom Lee, Woncheol Lee, Seung Hyeun Lee, Won Gun Kwack, Young Joong Kang
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The Current Status of the Administrative Dispositions of Nurses: A Nationwide Survey in South Korea
Suyoung KIM, Sanghee KIM
Journal of Nursing Research.2021; 29(5): e170. CrossRef
Occupational health nurses’ personal attitudes toward smoking: A cross-sectional study
Jihye Lee, Saerom Lee, Minkyu Lee, Young Joong Kang
Journal of Occupational Health.2021;[Epub] CrossRef

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Research Article

Satisfaction with life and the risk of occupational injury: Sung-Min Park, Hwan-Cheol Kim, Shin-Goo Park, Hyun-Suk Jang, Go Choi, Jong-Han Leem; Ann Occup Environ Med 2018;30:49. Published online August 2, 2018; DOI: https://doi.org/10.1186/s40557-018-0260-x

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Background

Occupational injuries increase burden on society as well as personal health. Low satisfaction with life may not only increases the risk of occupational injuries directly, but also influences other factors that increase the risk of occupational injury. Along with previous studies on the risk of occupational injury, we sought to explore the relationship between satisfaction with life and occupational injury.

Methods

The study participants were 6234workers health screened at a university hospital in Incheon. Information on occupational injury and satisfaction with life scale (SWLS) was obtained in a self-report format. Participants were allocated to one of four SWLS groups; the dissatisfied group, the slightly dissatisfied group, the slightly satisfied group, and the satisfied group. The analysis was performed using the chi-square test primarily and by logistic regression adjusted for potential confounders.

Results

In men, the un-adjusted and adjusted odds ratios (ORs) of low satisfaction with life (SWLS< 20) were 1.98(CI1.55–2.53) and 1.81(CI 1.41–2.32), respectively. When the SWLS were divided into four groups, the adjusted ORs of the slightly satisfied (20–25), slightly dissatisfied(15–19), and dissatisfied(≤14) groups were 1.21, 1.72, and 2.70, respectively. That is ORs tended to increase linearly with decreasing SWLS score (p for trend < 0.001). In women, this relation was of borderline significance at best.

When subjects were dichotomized based on SWLS scores, for males, the cured and adjusted RRs of occupational injury in the low satisfaction with life group were1.91 (95% CI: 1.50–2.42) and 1.66 (95% CI: 1.30–2.13), and for females, the adjusted-RR was marginally significant (1.67; 95% CI: 0.93–2.99).

When subjects were divided into four groups by SWLS scores, adjusted RRs tended to increase linearly with decreasing SWLS score for males (slightly satisfied: 1.18, 95% CI: 0.77–1.82; slightly dissatisfied: 1.65, 95% CI: 1.08–2.52; dissatisfied: 2.22, 95% CI: 1.44–3.42; p for trend < 0.001) and for females (slightly satisfied: 1.17, 95% CI: 0.42–3.30; slightly dissatisfied: 1.56, 95% CI: 0.56–4.36; dissatisfied: 2.38, 95% CI: 0.84–6.74; p for trend = 0.040).

Conclusions

This study suggests that the risk of occupational injury was higher in workers not satisfied with life, and indicates attention to satisfaction with life may promote the health of workers.

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Social epidemiology and time use
Craig T Dearfield, Robin H Pugh-Yi
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Thomas A. Buckley, Kelsey N. Bryk, Alexander L. Enrique, Thomas W. Kaminski, Katherine J. Hunzinger, Jessie R. Oldham
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Satisfaction with life in workers: A chained mediation model investigating the roles of resilience, career adaptability, self-efficacy, and years of education
Eleonora Topino, Andrea Svicher, Annamaria Di Fabio, Alessio Gori
Frontiers in Psychology.2022;[Epub] CrossRef
Effect of family stress on life satisfaction among female workers during the COVID-19 epidemic in China: Exploring the roles of anxiety symptoms and age
Songli Mei, Tongshuang Yuan, Leilei Liang, Hui Ren, Yueyang Hu, Zeying Qin, Junsong Fei, Ruilin Cao, Chuanen Li, Yuanchao Hu
Journal of Health Psychology.2022; 27(6): 1484. CrossRef
Association of work–life balance with occupational injury and work-related musculoskeletal pain among Korean workers
Jong-min An, Jinseok Kim, Seongyong Yoon, Kuck-Hyun Woo, Seong-yong Cho, Kibeom Kim, Ha-ram Jo
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Nonfatal Occupational Injuries among Workers in Microscale and Small-Scale Woodworking Enterprise in Addis Ababa, Ethiopia
Hailemichael Mulugeta, Yifokire Tefera, Meaza Gezu
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Research Article

Thyroid cancer among female workers in Korea, 2007–2015: Seonghoon Kang, Jinho Song, Taehwan Koh, One Park, Jong-Tae Park, Won-Jin Lee; Ann Occup Environ Med 2018;30:48. Published online July 16, 2018; DOI: https://doi.org/10.1186/s40557-018-0259-3

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Background

Prevalence of thyroid cancer has been increasing rapidly worldwide, especially among women. There has been a debate as to whether such an increase represents consequences of over-diagnosis or a true increase. To find the occupational risk of Korean female workers in different industry sectors, we analyzed the data of Korean female workers.

Methods

National Female Worker Cohort data that contain information on total female workers were used for our analysis of prevalence of thyroid cancer (C73 according to KCD-5, 6 code) derived from National Health Insurance data. By combining industrial codes from National Health Insurance Service and those from Korea Workers’ Compensation and Welfare Service, the classification of industrial codes became to consist of the total of thirty three representing both non-office (NO) and office (O) categories. Both an internal comparison among female workers within the cohort and an external comparison to compare female workers with Korean general female population were carried out.

Results

Among 149,258 female workers, 2,641 cases of thyroid cancers were identified. Differences in prevalence of thyroid cancer between female workers (40.5%) and general Korean female population (32.6%) were observed; however, the differences in prevalence of thyroid cancer between NO workers and O workers were not apparent. An analysis involving workers in Financial and insurance activities sector revealed that, standardized prevalence rate (SPR) of both NO (2.96, 95% CI = 2.01–4.20) and O workers (3.68, 95% CI = 3.10–4.33) increased significantly and that an AOR (adjusted odds ratio) increased marginally (1.38, 95% CI = 0.97–1.96). Further, when stratified in respect to the duration of employment, an AOR of female workers having been employed for more than 8 years showed a significant increase (1.63, 95% CI = 1.07–2.49).

Conclusions

Female workers had a higher risk of thyroid cancer than general female population but the difference between NO workers and O workers was not found to be significant in most industrial sectors. Further studies using data with information regarding specific occupational exposures are needed.

Electronic supplementary material

The online version of this article (10.1186/s40557-018-0259-3) contains supplementary material, which is available to authorized users.

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Thyroid Cancer Diagnostics Related to Occupational and Environmental Risk Factors: An Integrated Risk Assessment Approach
Gabriela Maria Berinde, Andreea Iulia Socaciu, Mihai Adrian Socaciu, Andreea Cozma, Armand Gabriel Rajnoveanu, Gabriel Emil Petre, Doina Piciu
Diagnostics.2022; 12(2): 318. CrossRef
Thyroid cancer risks among medical radiation workers in South Korea, 1996–2015
Won Jin Lee, Dale L. Preston, Eun Shil Cha, Seulki Ko, Hyeyeun Lim
Environmental Health.2019;[Epub] CrossRef

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Research Article

A cross-sectional study on the pulmonary function of residents in two urban areas with different PM₁₀ concentrations: data from the fourth Korea national health and nutrition examination survey (KNHANES) 2007–2009: Si Woo Park, Byoung Gwon Kim, Jung Woo Kim, Jung Woo Park, Jung Il Kim; Ann Occup Environ Med 2018;30:47. Published online July 16, 2018; DOI: https://doi.org/10.1186/s40557-018-0258-4

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Background

The present study aims to compare the pulmonary function of residents of Seoul special city (Seoul) and Jeju special self-governing province including Jeju city and Seogwipo city (Jeju), characterized by vastly different annual average airborne particulate matter with an aerodynamic diameter less ≤10 μm (PM₁₀) concentrations, with the annual average PM₁₀ concentration in Seoul being significantly higher than that in Jeju.

Methods

This cross-sectional study analyzed the pulmonary function test results and sociodemographic data of Korean adults ≥19 years of age derived from the 4th KNHANES, 2007–2009. A total of 830 individuals residing in Seoul or Jeju were included in this study. T-tests were used to analyze predicted values of forced expiratory volume in 1 sec (FEV1p), predicted values of forced vital capacity (FVCp) and FEV1/FVC ratio (FEV1/FVC), as dependent variables, to examine the differences in the subjects’ pulmonary function according to the city of residence. Stratified analysis was then performed to adjust for variables potentially affecting pulmonary function. The analysis was performed on subjects as a group and also following stratification according to sex and other variables.

Results

Seoul residents had a significantly lower FVCp than that of the Jeju residents (difference: 3.48%, p = 0.002). FEV1p, FVCp and FEV1/FVC of male Seoul residents were significantly lower than those of male Jeju residents (difference: 6.99, 5.11% and 0.03, respectively; p < 0.001, p = 0.001, p = 0.001). In male subjects, statistically significant results were obtained even after adjusting the influence of other variables through stratified analysis.

Conclusion

The present analysis was based on cross-sectional data collected at one point in time. Therefore, unlike longitudinal studies, it does not establish a clear causal association between the variables. Nevertheless, this study found that pulmonary function among subjects residing in Seoul was significantly decreased compared to that of subjects residing in Jeju.

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Association of Urine (pH < 5.5) with Community Periodontal Index (CPI) and the Number of Remaining Teeth in Korean Adults: A Cross-Sectional Study Using Data from Korea National Health and Nutrition Examination Survey 2016–2018
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Su-Yeon Hwang, Jung-Eun Park
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Soo Beom Choi, Sungha Yun, Sun-Ja Kim, Yong Bum Park, Kyungwon Oh
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Research Article

Working hours and depressive symptoms: the role of job stress factors: Yeogyeong Yoon, Jia Ryu, Hyunjoo Kim, Chung won Kang, Kyunghee Jung-Choi; Ann Occup Environ Med 2018;30:46. Published online July 13, 2018; DOI: https://doi.org/10.1186/s40557-018-0257-5

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Background

South Korea is one of the countries with the longest working hours in the OECD countries. The aim of this study was to evaluate the effect of working hours on depressive symptoms and the role of job stress factors between the two variables among employees in South Korea.

Methods

This study used data from the Korea Working Conditions Survey in 2014. Study subjects included 23,197 employees aged 19 years or older who work more than 35 h per week. Working hours were categorized into 35–39, 40, 41–52, 53–68, and more than 68 h per week. Depressive symptoms were assessed using the WHO’s Well-Being Index with a cut-off score of 13. We calculated prevalence ratios of depressive symptoms according to working hours using log-binomial regression. Through the percentage change in prevalence ratios, we identified the extent of the role of job stress factors that explain depressive symptoms.

Results

The risks of depressive symptoms were significantly higher in people who worked 35–39 h per week (PR: 1.09, CI: 1.01–1.18), 53–68 h/week (PR: 1.21, CI: 1.16–1.25), and more than 68 h/week (PR: 1.14, CI: 1.07–1.21) than 40 h/week, after adjusting for confounding variables. Job stress explained the effects of long working hours on depressive symptoms in about 20–40% of the groups working more than 40 h/week. Among the factors of job stress, social support was 10–30%, which showed the highest explanatory power in all working hours. Reward explained 15–30% in the more than 52 h working group, and reward was the most important factor in the working group that exceeded 68 h.

Conclusions

We showed the working hours could be an independent risk factor for depressive symptoms in employees. To improve workers’ mental health, it is important to strengthen social support in the workplace, to provide adequate rewards as they work, and ultimately to regulate the appropriate amount of working hours.

Citations

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Research Article

The characteristics of asbestos-related disease claims made to the Korea Workers’ Compensation and Welfare Service (KCOMWEL) from 2011 to 2015: Yon Soo An, Hyung Doo Kim, Hyeoung Cheol Kim, Kyoung Sook Jeong, Yeon Soon Ahn; Ann Occup Environ Med 2018;30:45. Published online July 11, 2018; DOI: https://doi.org/10.1186/s40557-018-0256-6

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Background

This study aimed to enhance understanding of the epidemiologic characteristics of asbestos-related diseases, and to provide information that could inform policy-making aimed at prevention and compensation for occupational asbestos exposure, through analyzing asbestos-related occupational disease claims to Korea Workers’ Compensation and Welfare Service from 2011 to 2015.

Methods

We analyzed 113 workers who filed medical care claims or survivor benefits for asbestos exposure and occupational-related disease from 2011 to 2015. Among these claims, we selected approved workers’ compensation claims relating to malignant mesothelioma and lung cancer, and analyzed the general characteristics, exposure characteristics, pathological characteristics, and occupation and industry distribution.

Results

Malignant mesothelioma and lung cancer occurred predominantly in males at 89.7 and 94%, respectively. The mean age at the time of diagnosis for malignant mesothelioma and lung cancer was 59.5 and 59.7 years, respectively, while the latency period for malignant mesothelioma and lung cancer was 34.1 and 33.1 years, respectively. The companies involving exposed workers were most commonly situated within the Busan-Ulsan-Gyeongnam region. Histology results for lung cancer indicated adenocarcinoma as the most common form, accounting for approximately one half of all claims, followed by squamous cell carcinoma, and small cell lung cancer. The most common occupation type was construction in respect of malignant mesothelioma, and shipbuilding in respect of lung cancer.

Conclusions

Considering the long latency period of asbestos and that the peak period of asbestos use in Korea was throughout the mid-1990s, damage due to asbestos-related diseases is expected to show a continued long-term increase. Few studies providing an epidemiologic analysis of asbestos-related diseases are available; therefore, this study may provide baseline data to assist in predicting and preparing for future harm due to asbestos exposure.

Trial registration

DUIH 2018–02–004-001. Registered 28 Februrary 2018.

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Paul J Nicholson
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Standardized Incidence Ratio and Standardized Mortality Ratio of Malignant Mesothelioma in a Worker Cohort Using Employment Insurance Database in Korea
Eun-A Kim
International Journal of Environmental Research and Public Health.2021; 18(20): 10682. CrossRef
Survival of Korean Patients with Malignant Pleural Mesothelioma Compensated for the Asbestos Injury Relief
Min-Sung Kang, Sung-Soo Lee, Soon-Chan Kwon, Da-An Huh, Yong-Jin Lee
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The Epidemiologic Characteristics of Malignant Mesothelioma Cases in Korea: Findings of the Asbestos Injury Relief System from 2011–2015
Soon-Chan Kwon, Sung-Soo Lee, Min-Sung Kang, Da-An Huh, Yong-Jin Lee
International Journal of Environmental Research and Public Health.2021; 18(19): 10007. CrossRef
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L. Vimercati, D. Cavone, A. Caputi, M. C. Delfino, L. De Maria, G. M. Ferri, G. Serio
BMC Research Notes.2019;[Epub] CrossRef

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Research Article

Association between cadmium and anti-Mullerian hormone in premenopausal women at particular ages: Yu min Lee, Hye Won Chung, Kyungah Jeong, Yeon-Ah Sung, Hyejin Lee, Shinhee Ye, Eun-Hee Ha; Ann Occup Environ Med 2018;30:44. Published online July 9, 2018; DOI: https://doi.org/10.1186/s40557-018-0255-7

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Background

Anti-Mullerian hormone (AMH) in women is secreted by granulosa cells of antral follicles. AMH appears to be a very stable marker for ovarian function. It may be used to diagnosis cases of premature ovarian failure, polycystic ovary syndrome (PCOS), and ovarian tumors. It has been suggested that cadmium exposure can reduce female fecundity. The purpose of this study was to investigate whether environmental exposure to cadmium was associated with alterations in AMH with regards to age.

Methods

In a cross-sectional study, the data of premenopausal women living in Seoul, ranging from 30 to 45 of age was collected. The study included a total of 283 women who completed serum AMH and whole blood cadmium assessments. Linear regression analyses were used in order to examine the association between cadmium and AMH. Given that age was the strongest confounder in both cadmium and AMH concentrations, we stratified subjects by 5 years old and analyzed their data.

Results

Geometric mean concentrations of blood cadmium and AMH were 0.97 μg/L and 3.02 ng/ml, respectively. Total association between cadmium and AMH was statistically significant (adjusted coefficient = − 0.34 (0.15), p = 0.02). After stratification, the only age group with a negative association between cadmium and AMH were the women raging between 30 and 35 years (adjusted coefficient = − 0.43 (0.18), p = 0.01).

Conclusions

The results of this study suggest that environmental exposure to cadmium may alter the AMH level of premenopausal women, depending on their age group.

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Research Article

Effect of teacher’s working conditions on voice disorder in Korea: a nationwide survey: Yi-Ryoung Lee, Hyoung-Ryoul Kim, Seyoung Lee; Ann Occup Environ Med 2018;30:43. Published online July 3, 2018; DOI: https://doi.org/10.1186/s40557-018-0254-8

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Background

Korean teacher’s working conditions are deteriorating. There is concern about the deterioration of teachers’ health and voice disorder is one of the most common problems. Teacher’s vocal health is important for them and their students. The aim of the present study was to investigate working conditions that may affect voice disorders.

Methods

In all, 79 primary and secondary schools were randomly selected for a nationwide school system survey (N = 3345). In 64 schools, 1617 (48.3%) teachers participated via a postal self-report questionnaire from June 2016 to August 2016. After applying inclusion and exclusion criteria, data from 1301 teachers’ were used for analysis. Multiple logistic regression was used to investigate the associations between general, work-related factors, and frequent voice disorders (fVDs) to estimate the adjusted odds ratio(aOR).

Results

Teachers who reported voice symptoms more than once a week (fVD) made up 11.6%. In a multiple logistic regression, fVD was significantly associated with female, difficulty in applying for sick leave as needed, music teachers (primary school), and less than 6 h of sleep per day (primary school). The aOR for fVD was 2.72 (0.83–8.10) in the longest working hours group (> 52 h/wk) among the primary school teachers, and 1.90 (0.80–4.73) in the longest class hour group (≥ 20 h/wk), 1.52 (0.90–2.62) in homeroom teachers among the secondary school teachers, but not statistically significant.

Conclusions

Korean teachers’ working conditions are associated with fVDs. The school health system must take steps to prevent and treat voice disorders of teachers.

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Research Article

The associations between work-related factors and temporomandibular disorders among female full-time employees: findings from the Fourth Korea National Health and Nutrition Examination Survey IV (2007–2009): Wook Han, Soon-Chan Kwon, Yong-Jin Lee, Chan Park, Eun-Chul Jang; Ann Occup Environ Med 2018;30:42. Published online June 20, 2018; DOI: https://doi.org/10.1186/s40557-018-0253-9

Abstract PDF PubReader ePub

Background

The aim of this study was to investigate the association between work-related factors and temporomandibular disorders (TMD) among female full-time employees using representative data from a national population-based survey.

Methods

Data from the Fourth Korea National Health and Nutrition Examination Survey IV (2007–2009) were used to analyze 1,612 women. Complex samples logistic regression was applied for adjusting for general characteristics and work-related factors to examine the association between work-related factors and TMD.

Results

The prevalence of TMD was 12.8% in this study population. With respect to age, educational status, marital status, problem drinking, exercise, and stress, there were statistically significant differences in the prevalence of TMD. In logistic regression analyses on complex samples, based on 40 h or less per week, odds ratios (ORs) for respondents who worked 40–48 working hours, 49–60 working hours, and more than 60 h were 1.16 (95% confidence interval (CI) 0.69–1.94), 1.41 (95% CI 0.79–2.54), and 2.43 (95% CI 1.29–4.59), after adjusting for general characteristics, working schedule, employment status, and occupation.

Conclusions

This study found that long working hours were significantly associated with TMD in Korean female full-time employees.

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Ricardo Luiz de Barreto Aranha, Renata de Castro Martins, Diego Rodrigues de Aguilar, Johana Alejandra Moreno-Drada, Woosung Sohn, Carolina de Castro Martins, Mauro Henrique Nogueira Guimarães de Abreu, Vincenzo Grassia
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Dose–Response Relationship between Environmental Exposure to Nickel and Pulmonary Function in the Korean General Population Aged 40 or Older
Joon-Sung Joh, Mo-Yeol Kang, Jun-Pyo Myong
International Journal of Environmental Research and Public Health.2021; 18(13): 7016. CrossRef
Relationship between anxiety, quality of life, and sociodemographic characteristics and temporomandibular disorder
Camila Maria Bastos Machado de Resende, Laura Géssica Dantas da Silva Rocha, Raissa Pinheiro de Paiva, Camila da Silva Cavalcanti, Erika Oliveira de Almeida, Angelo Giuseppe Roncalli, Gustavo Augusto Seabra Barbosa
Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology.2020; 129(2): 125. CrossRef

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Research Article

Spatial analysis between particulate matter and emergency room visits for conjunctivitis and keratitis: Jung-Youb Lee, Jung-Won Kim, Eun-Jung Kim, Mi-Young Lee, Chang-Wook Nam, In-Sung Chung; Ann Occup Environ Med 2018;30:41. Published online June 11, 2018; DOI: https://doi.org/10.1186/s40557-018-0252-x

Abstract PDF Supplementary Material PubReader ePub

Background

The concentration of particulate matter in the air varies depending on the region because it is lightweight and generated from a variety of sources. To assess the relationship between particulate matter and eye disease, this study analyzes the concentration data obtained from spatial analysis of particulate matter and emergency visit data.

Methods

The study included 769 residents of Daegu, Korea who had visited an emergency room for the problem of conjunctivitis or keratitis. Concentrations of PM₁₀ and other air pollutants were obtained from the Korean Ministry of the Environment. PM₁₀ concentrations and the number of patients from each of 143 administrative dongs (sub-municipal level administrative units) of the city of Daegu were obtained using spatial analysis. The patient distribution and PM₁₀ concentration were mapped for comparison, and their relationship was examined using scatter plot, regression analysis, and the independent sample t-test.

Results

The number of patients with conjunctivitis and keratitis was significantly higher in the regions of the top 20% areas than the bottom 20% areas in terms of PM₁₀ concentration. The distribution of PM₁₀ concentration and number of patients was visually similar on the map. The concentration of PM₁₀ and the number of patients showed a dose–response relationship. When the concentrations of other air polluta9nts were controlled for, the numbers of conjunctivitis and keratitis patients were 0.04 per 1000 ER patients and 0.10 per 1000 ER patients, respectively.

Conclusion

As PM₁₀ is associated with the prevalence of conjunctivitis and keratitis, measures to reduce particulate matter through environmental methods are needed.

Electronic supplementary material

The online version of this article (10.1186/s40557-018-0252-x) contains supplementary material, which is available to authorized users.

Citations

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Consequences of exposure to particulate matter on the ocular surface: Mechanistic insights from cellular mechanisms to epidemiological findings
Phit Upaphong, Chanisa Thonusin, Ornpailin Wanichthanaolan, Nipon Chattipakorn, Siriporn C. Chattipakorn
Environmental Pollution.2024; 345: 123488. CrossRef
Mechanisms of PM10 Disruption of the Nrf2 Pathway in Cornea
Mallika Somayajulu, Farooq S. Muhammed, Robert Wright, Sharon A. McClellan, Linda D. Hazlett
International Journal of Molecular Sciences.2024; 25(7): 3754. CrossRef
Impact of Airborne Exposure to PM10 Increases Susceptibility to P. aeruginosa Infection
Sharon A. McClellan, Robert Wright, Farooq Muhammed, Linda D. Hazlett
International Journal of Environmental Research and Public Health.2024; 21(6): 722. CrossRef
Air Pollution and Meteorological Conditions Significantly Associated With Vernal Keratoconjunctivitis Exacerbations
Eran Levanon, Ido Peles, Michal Gordon, Lena Novack, Erez Tsumi
Investigative Opthalmology & Visual Science.2023; 64(10): 37. CrossRef
Clinical Impact of Ambient Particulate Matters on Dry Eye Disease
Chang Hwan Kim, Yong Woo Ji
Annals of Optometry and Contact Lens.2023; 22(4): 125. CrossRef
Airborne Exposure of the Cornea to PM10 Induces Oxidative Stress and Disrupts Nrf2 Mediated Anti-Oxidant Defenses
Mallika Somayajulu, Sharon A. McClellan, Robert Wright, Ahalya Pitchaikannu, Bridget Croniger, Kezhong Zhang, Linda D. Hazlett
International Journal of Molecular Sciences.2023; 24(4): 3911. CrossRef
Toxic External Exposure Leading to Ocular Surface Injury
Steven H. Rauchman, Brandon Locke, Jacqueline Albert, Joshua De Leon, Morgan R. Peltier, Allison B. Reiss
Vision.2023; 7(2): 32. CrossRef
PM10 and Pseudomonas aeruginosa: effects on corneal epithelium
Mallika Somayajulu, Sharon A. McClellan, Farooq Muhammed, Robert Wright, Linda D. Hazlett
Frontiers in Cellular and Infection Microbiology.2023;[Epub] CrossRef
The effect of social determinants of health on severity of microbial keratitis presentation at a tertiary eye care hospital in Southern India
Anvesh Annadanam, Patrice M Hicks, Ming-Chen Lu, Mercy Pawar, Prabhleen Kochar, Suvitha Selvaraj, Dhanya Kuppuraj, Chetan Rathod, Rekha Sravya Muppala, Smriti Gaur, Abinaya Krishnan, SR Sumithra, Maria A Woodward, N Venkatesh Prajna
Indian Journal of Ophthalmology.2023; 71(6): 2448. CrossRef
Impacts of Climate Change on Ocular Health: A Scoping Review
Yee Ling Wong, Shiao Wei Wong, Darren S.J. Ting, Alankrita Muralidhar, Sagnik Sen, Olivia Schaff, Hannah Istre-Wilz, Barbara Erny
The Journal of Climate Change and Health.2023; : 100296. CrossRef
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Wanzhou Wang, Wenlou Zhang, Hongxia Ge, Baiqi Chen, Jingjing Zhao, Jun Wu, Zefeng Kang, Xinbiao Guo, Furong Deng, Qingbian Ma
Environmental Science and Pollution Research.2022; 29(15): 22613. CrossRef
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Eun-jung Koo, Jin-Gon Bae, Eun Jung Kim, Yong-Hoon Cho
Journal of Korean Medical Science.2021;[Epub] CrossRef
The burden of acute conjunctivitis attributable to ambient particulate matter pollution in Singapore and its exacerbation during South-East Asian haze episodes
Joel Aik, Rae Chua, Natasha Jamali, Elaine Chee
Science of The Total Environment.2020; 740: 140129. CrossRef
Epidemiological aspects of allergic conjunctivitis
Dai Miyazaki, Kazumi Fukagawa, Shigeki Okamoto, Atsuki Fukushima, Eiichi Uchio, Nobuyuki Ebihara, Jun Shoji, Kenichi Namba, Yumiko Shimizu
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Peder Wolkoff
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Airborne Particulates Affect Corneal Homeostasis and Immunity
Mallika Somayajulu, Sandamali Ekanayaka, Sharon A. McClellan, Denise Bessert, Ahalya Pitchaikannu, Kezhong Zhang, Linda D. Hazlett
Investigative Opthalmology & Visual Science.2020; 61(4): 23. CrossRef
Air pollution significantly associated with severe ocular allergic inflammatory diseases
Dai Miyazaki, Kazumi Fukagawa, Atsuki Fukushima, Hiroshi Fujishima, Eiichi Uchio, Nobuyuki Ebihara, Jun Shoji, Etsuko Takamura, Kenichi Namba, Yuichi Ohashi, Shigeki Okamoto, Yoshiyuki Satake, Hiroshi Ohtsu, Yumiko Shimizu, Yoshitsugu Inoue
Scientific Reports.2019;[Epub] CrossRef
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International Journal of Environmental Research and Public Health.2019; 16(19): 3652. CrossRef

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Research Article

Association between serum ferritin and hypertension according to the working type in Korean men: the fifth Korean National Health and nutrition examination survey 2010–2012: Dong-Hoon Lee, Seong-Kyu Kang, Won-Jun Choi, Kyeong Min Kwak, Dukyun Kang, Sang Ha Lee, Jun-Hyung Lee; Ann Occup Environ Med 2018;30:40. Published online June 11, 2018; DOI: https://doi.org/10.1186/s40557-018-0251-y

Abstract PDF PubReader ePub

Background

Several studies suggest that serum ferritin concentrations reflect systemic inflammation, and high ferritin levels can increase the risk of hypertension in adult men. Shift work is also known to increase the risk of hypertension; however, there has been no study about the relationship between serum ferritin levels and the prevalence of hypertension according to the working type.

Methods

This cross-sectional study included 4,442 male participants (3,651 daytime workers and 791 shift workers) who participated in the fifth Korean National Health and Nutrition Examination Survey. Hypertension was defined as a systolic blood pressure greater than or equal to 140 mmHg, a diastolic blood pressure greater than or equal to 90 mmHg or the current use of antihypertensive medications regardless of blood pressure values. For the statistical analyses, serum ferritin levels were reclassified into quartiles, and complex sample analyses were used to evaluate the relationship between serum ferritin levels and the prevalence of hypertension according to the working type in this study.

Results

Serum ferritin and shift work were positively associated with the prevalence of hypertension. The effect of interaction was above multiplicative. When compared to participants in the lowest serum ferritin quartile, the odds ratio for hypertension for participants in the highest serum ferritin quartile was 1.372 (1.027–1.833) in daytime workers and 2.009 (1.042–3.873) in shift workers after adjustment.

Conclusions

The prevalence of hypertension increased as ferritin levels increased in individuals, especially in shift workers.

Citations

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Jeoung A. Kwon, Eunjung Park, Seyoung Kim, Byungmi Kim
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WITHDRAWN: Can Traditional Chinese Medicine provide insights into controlling the COVID-19 pandemic: Serpentinization-induced lithospheric long-wavelength magnetic anomalies in Proterozoic bedrocks in a weakened geomagnetic field mediate the aberrant tran
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