Annals of Occupational and Environmental Medicine

Sang Ha Lee

3 Articles

Multidimensional sleep quality of dependent self-employment workers: Sang Ha Lee, Dukyun Kang, Junhyeong Lee, Uijin Kim, Seunghon Ham, Wanhyung Lee, Won-Jun Choi, Seong-Kyu Kang; Ann Occup Environ Med 2020;32:e6. Published online January 22, 2020; DOI: https://doi.org/10.35371/aoem.2020.32.e6

Background

The number of workers in non-standard employment (NSE) is increasing due to industrial change and technological development. Dependent self-employment (DSE), a type of NSE, was created decades ago. Despite the problems associated with this new type of employment, few studies have been conducted on the effects by DSE on health, especially sleep quality. This study aims to determine the relationship between DSE and sleep quality.

Methods

This study analyzed data of 50,250 wage workers from the fifth Korean Working Conditions Survey. Workers that did not respond or refused to answer any questions related to variables were excluded, and finally 36,709 participants were included in this study. A total of 2,287 workers (6.2%) were compared with non-DSE (34,422; 93.8%) workers, and multiple logistic regression analyses were applied.

Results

DSE status had a significant association with difficulty falling asleep (odds ratio [OR]: 1.331, 95% confidence interval [CI]: 1.178–1.504), difficulty maintaining sleep (OR: 1.279; 95% CI: 1.125–1.455), and extreme fatigue after waking up (OR: 1.331; 95% CI: 1.184–1.496). A multiple logistic regression of the variables for sleep quality in DSE showed a significant association with exposure to physical factors for all types of poor sleep quality as well as shift work for difficulty maintaining sleep with extreme fatigue after waking up. Long working hours and emotional labor were also associated with extreme fatigue after waking up.

Conclusions

This study shows a significant association between DSE and poor sleep quality, especially when workers were exposed to physical risk factors (noise, vibration, abnormal temperature, etc.) and shift work.

Citations

Citations to this article as recorded by

Teleworking Is Significantly Associated with Anxiety Symptoms and Sleep Disturbances among Paid Workers in the COVID-19 Era
Minji Kim, Inho Park, Hyojin An, Byungyoon Yun, Jin-Ha Yoon
International Journal of Environmental Research and Public Health.2023; 20(2): 1488. CrossRef
Self-employment and health inequality of migrant workers
Deshui Zhou, Xin Wen
BMC Health Services Research.2022;[Epub] CrossRef
Mental health symptoms among dependent contractors in Korea: a cross-sectional study based on the Fifth Korean Working Condition Survey
Seong-Uk Baek, Sung-Shil Lim, Sehyun Yun, Won-Tae Lee, Min-Seok Kim, Jin-Ha Yoon, Jong-Uk Won
Annals of Occupational and Environmental Medicine.2022;[Epub] CrossRef
The Effect of Job Demands, Job Resources, and Musculoskeletal Complaints on Presenteeism Among the Dependent Self-employment Workers in Korea
Jiyun Kim, Sookja Choi
Journal of Occupational & Environmental Medicine.2022; 64(9): 719. CrossRef
Association between physical risk factors and sleep disturbance among workers in Korea: The 5th Korean Working Conditions Survey
Inho Park, Seunghan Kim, Yangwook Kim, Byungyoon Yun, Jin-Ha Yoon
Sleep Medicine.2022; 100: 157. CrossRef
The Impact of Mandate Contract and Self-Employment on Workers’ Health—Evidence from Poland
Katarzyna Piwowar-Sulej, Dominika Bąk-Grabowska
International Journal of Environmental Research and Public Health.2021; 18(6): 3138. CrossRef

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Association between shift work and hyperhomocysteinemia in male workers: Dukyun Kang, Seong-Kyu Kang, Won-Jun Choi, Sang Ha Lee, Jun-Hyung Lee, Kyeongmin Kwak; Ann Occup Environ Med 2019;31:e1. Published online May 1, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e1

Abstract PDF PubReader ePub

Background

Shift work is associated with a higher risk of cardiovascular diseases. Here, we sought to assess the relationship between shift work and plasma homocysteine levels. Determining the correlations between shift work and homocysteine levels may provide a better understanding of the mechanisms underlying cardiovascular diseases.

Methods

This study was performed using data from routine health examinations of steel workers in 2017. In total, 431 male workers (70 daytime workers and 361 shift workers) employed on a rolling departure schedule were recruited. Plasma homocysteine levels > 15 μmol/L were considered elevated. The χ², analysis of variance, and multiple logistic regression analyses were used to examine the association between shift work and plasma homocysteine levels.

Results

In comparison to daytime workers, the odds ratio (OR) of hyperhomocysteinemia in individuals with < 10 years of shift work was 1.14 (95% confidence interval [CI]: 0.64–2.03), compared to 2.01 (95% CI: 1.14–3.54) for workers with ≥ 10 years of experience. After adjusting for confounding variables, the adjusted OR for shift workers with < 10 years of experience was 0.95 (95% CI: 0.50–1.80), compared to 2.00 (95% CI: 1.07–3.74) for workers with ≥ 10 years of experience.

Conclusions

The risk of hyperhomocysteinemia was significantly higher in shift workers compared to those working normal daytime hours, particularly among long-term shift workers.

Citations

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Shift work is significantly and positively associated with dementia: A meta-analysis study
Kuo-Wei Lee, Chen-Cheng Yang, Chun-Hung Chen, Chih-Hsing Hung, Hung-Yi Chuang
Frontiers in Public Health.2023;[Epub] CrossRef
Association between shift work and serum homocysteine level in female electronic manufacturing services workers
Jae Won Lim, Chan Woo Kim, Hyoung Ouk Park, Eui Yup Chung, Changho Chae, JunSeok Son, Young Hoo Shin, Seung Hyun Park, Sang Moon Choi
Annals of Occupational and Environmental Medicine.2023;[Epub] CrossRef
Consequences of Shift Work and Night Work: A Literature Review
Isabel Silva, Daniela Costa
Healthcare.2023; 11(10): 1410. CrossRef
Different exposure metrics of rotating night shift work and hyperhomocysteinaemia among Chinese steelworkers: a cross-sectional study
Shengkui Zhang, Yongbin Wang, Qinglin Li, Zhende Wang, Han Wang, Chao Xue, Ying Zhu, Weijun Guan, Juxiang Yuan
BMJ Open.2020; 10(12): e041576. CrossRef

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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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Journal of the American Heart Association.2024;[Epub] CrossRef
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Santu Ghosh, Tinku Thomas, Raghu Pullakhandam, Krishnapillai Madhavan Nair, Harshpal S. Sachdev, Anura V. Kurpad
European Journal of Clinical Nutrition.2023; 77(4): 436. CrossRef
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Hypertension Research.2023; 46(9): 2085. CrossRef
Dietary intakes of total, nonheme, and heme iron and hypertension risk: a longitudinal study from the China Health and Nutrition Survey
Shangling Wu, Peiyan Chen, Jingjing He, Zhaoyan Liu, Yi Sui, Keji Li, Aiping Fang
European Journal of Nutrition.2023; 62(8): 3251. CrossRef
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Haoran Wang, Qianjin Qi, Shuaihua Song, Di Zhang, Li Feng
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Andong He, Xiaofeng Yang, Yuzhen Ding, Lu Sun, Meiting Shi, Ruiman Li
Clinical and Experimental Hypertension.2022; 44(6): 523. CrossRef
Influence of serum ferritin combined with blood cadmium concentrations on blood pressure and hypertension: From the Korean National Health and Nutrition Examination Survey
Jeoung A. Kwon, Eunjung Park, Seyoung Kim, Byungmi Kim
Chemosphere.2022; 288: 132469. CrossRef
Role of Iron-Related Oxidative Stress and Mitochondrial Dysfunction in Cardiovascular Diseases
Fang Yan, Kaifeng Li, Wenjuan Xing, Mingqing Dong, Mingliang Yi, Haifeng Zhang, Tao Li
Oxidative Medicine and Cellular Longevity.2022; 2022: 1. CrossRef
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Xingchen Wang, Xizhi Wang, Yingchao Gong, Xiaoou Chen, Danfeng Zhong, Jun Zhu, Lenan Zhuang, Jing Gao, Guosheng Fu, Xue Lu, Dongwu Lai
Nutrients.2022; 14(16): 3258. CrossRef
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Minerva J Taeubert, Clarissa J Wiertsema, Marijn J Vermeulen, Hugo G Quezada-Pinedo, Irwin K Reiss, Martina U Muckenthaler, Romy Gaillard
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Suchanda Sahu, Medha Menon, Joseph John
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