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The Association Between Long Working Hours and High-Sensitivity C-Reactive Protein in Older Aged Individuals: The Korea National Health and Nutrition Examination Survey (KNHANES) 2015

Lee, Jongin, MD; Kim, Hyoung-Ryoul, MD, PhD

Journal of Occupational and Environmental Medicine: September 2018 - Volume 60 - Issue 9 - p 775–780
doi: 10.1097/JOM.0000000000001359
ORIGINAL ARTICLES

Objective: The objective of this study was to show the association of high-sensitivity C-reactive protein (hs-CRP) level with working hours in different age groups.

Methods: We used data from Korean National Health and Nutrition Survey. The odds ratios (ORs) and 95% confidence intervals (CIs) of variables for elevated hs-CRP (>3.0 mg/L) were generated with logistic regression models. Significant variables were verified with an adjusted multivariate logistic model after stratification of age groups.

Results: Working for more than 55 hours per week was associated with elevated hs-CRP level in the old-ages group (≥ 60 years old: OR 2.18, 95% CI 1.07 to 4.45). Working for 40 to 55 hours per week was associated with decreased hs-CRP in the young-ages group (OR 0.58, 95% CI 0.37 to 0.93).

Conclusion: Working hours appear to influence the levels of hs-CRP in individuals aged older than 60 years.

Department of Public Health and Hygiene, Andong Public Health Center, Andong, Korea (Dr Lee); Department of Medicine, Graduate School, The Catholic University of Korea, Seoul, Korea (Dr Lee); and Department of Occupational and Environmental Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea (Dr Kim).

Address correspondence to: Hyoung-Ryoul Kim, MD, PhD, Department of Occupational and Environmental Medicine, College of Medicine, The Catholic University of Korea, 222 Banpodae-ro, Seocho-gu, Seoul 06591, Republic of Korea (cyclor@catholic.ac.kr).

This study is done without any funding source.

Authors Kim and Lee have no relationships/conditions/circumstances that present potential conflict of interest.

The JOEM editorial board and planners have no financial interest related to this research.

Copyright © 2018 by the American College of Occupational and Environmental Medicine