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Effect of Long Working Hours on Self-reported Hypertension among Middle-aged and Older Wage Workers
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Dong Hyun Yoo, Mo-yeol Kang, Domyung Paek, Bokki Min, Sung-il Cho
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Ann Occup Environ Med 2014;26:25-25. Published online September 3, 2014
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DOI: https://doi.org/10.1186/s40557-014-0025-0
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Abstract
PDFPubReaderePub
- Objectives
Many studies have reported an association between overwork and hypertension. However, research on the health effects of long working hours has yielded inconclusive results. The objective of this study was to identify an association between overtime work and hypertension in wage workers 45 years and over of age using prospective data. MethodsWage workers in Korea aged 45 years and over were selected for inclusion in this study from among 10,254 subjects from the Korean Longitudinal Study of Ageing. Workers with baseline hypertension and those with other major diseases were excluded. In the end, a total of 1,079 subjects were included. A Cox proportional hazards model was used to calculate hazard ratios and adjust for baseline characteristics such as sex, age, education, income, occupation, form of employment, body mass index, alcohol habit, smoking habit, regular exercise, and number of working days per week. Additional models were used to calculate hazard ratios after gender stratification. ResultsAmong the 1,079 subjects, 85 workers were diagnosed with hypertension during 3974.2 person-months. The average number of working hours per week for all subjects was 47.68. The proportion of overtime workers was 61.0% (cutoff, 40 h per week). Compared with those working 40 h and less per week, the hazard ratio of subjects in the final model, which adjusted for all selected variables, working 41-50 h per week was 2.20 (95% confidence interval [CI], 1.19–4.06), that of subjects working 51-60 h per week was 2.40 (95% CI, 1.07–5.39), and that of subjects working 61 h and over per week was 2.87 (95% CI, 1.33–6.20). In gender stratification models, the hazard ratio of the females tended to be higher than that of the males. ConclusionAs the number of working hours per week increased, the hazard ratio for diagnosis of hypertension significantly increased. This result suggests a positive association between overtime work and the risk of hypertension.
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Citations
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Association between Physical Workload and Work-related Back Pain: A Nationwide Study
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Jae Il Oh, Dong Hyun Yoo, Do Myung Paek, Jung Sun Park, Sung Il Cho
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Korean Journal of Occupational and Environmental Medicine 2011;23(3):298-308. Published online September 30, 2011
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DOI: https://doi.org/10.35371/kjoem.2011.23.3.298
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Abstract
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- OBJECTIVES
To date, no population-based epidemiological studies have estimated the association between physical workload (standing or walking, carrying heavy loads, carrying people, repetitive hand or arm movements, wearing protective equipment) and work-related back pain in Korea. The purpose of this study was to evaluate the relationship between physical workload and work-related back pain using a nationwide survey. METHODS We analyzed data obtained from working men and women age 15 to 64 (n=10,043) who participated in the 2006 national working condition survey of random sample workers in Korea. Using both simple and multiple logistic regression analysis, the association between physical workload and work-related back pain was evaluated. RESULTS Carrying heavy loads, repetitive hand or arm movements, and wearing protective equipment were associated with an increased risk of work-related back pain. CONCLUSIONS This study identifies that an increased risk of work-related back pain related to the nature and intensity of the physical workload of the general working population in Korea. We also found a strong association between repetitive hand or arm movements and back pain.
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Citations
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Gi-Yeol Kim, Jung-Lim Oh, Kyoung-Ok Hwang Journal of the Korea Academia-Industrial cooperation Society.2015; 16(1): 536. CrossRef
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