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Association between Changes in the Regularity of Working Hours and Cognitive Impairment in Middle-Aged and Older Korean Workers: The Korean Longitudinal Study of Aging, 2008–2018

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  • Won-Tae Lee

    (Department of Occupational and Environmental Medicine, Severance Hospital, College of Medicine, Yonsei University, Seoul 03722, Korea
    The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul 03722, Korea
    Department of Public Health, Graduate School, Yonsei University, Seoul 03722, Korea)

  • Sung-Shil Lim

    (Department of Occupational and Environmental Medicine, Severance Hospital, College of Medicine, Yonsei University, Seoul 03722, Korea
    The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul 03722, Korea)

  • Jin-Ha Yoon

    (The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul 03722, Korea
    Department of Public Health, Graduate School, Yonsei University, Seoul 03722, Korea
    Department of Preventive Medicine, College of Medicine, Yonsei University, Seoul 03722, Korea)

  • Jong-Uk Won

    (Department of Occupational and Environmental Medicine, Severance Hospital, College of Medicine, Yonsei University, Seoul 03722, Korea
    The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul 03722, Korea
    Department of Public Health, Graduate School, Yonsei University, Seoul 03722, Korea)

Abstract

Changes in the regularity of working hours affect the cognitive function of middle-aged workers. This study investigated the association between alterations in the regularity of working hours and cognitive impairment in middle-aged and elderly Korean workers. The data from the Korean Longitudinal Study of Aging were analyzed and cognitive function was evaluated using the Korean version of the mini–mental state examination. A score of <23 points was defined as cognitive impairment. The effect of changes in the regularity of working hours on cognitive impairment development was assessed using the generalized estimating equation model. Compared with regular working hours group, the odds ratios (ORs; 95% confidence interval) of the “consistently irregular”, “regular to irregular”, and “irregular to regular” groups were 1.56 (1.30–1.88), 1.46 (1.20–1.77), and 1.24 (1.01–1.53), respectively. The risk of cognitive deterioration was found in the “consistently irregular” group. However, only workers with normal working hours in the “regular to irregular” group had a significant risk of cognitive deterioration (1.51 (1.21–1.89)). Altered working hours were associated with cognitive impairment in middle-aged and older workers. The study emphasizes the need to implement a standard work schedule that is suitable for middle-aged workers.

Suggested Citation

  • Won-Tae Lee & Sung-Shil Lim & Jin-Ha Yoon & Jong-Uk Won, 2022. "Association between Changes in the Regularity of Working Hours and Cognitive Impairment in Middle-Aged and Older Korean Workers: The Korean Longitudinal Study of Aging, 2008–2018," IJERPH, MDPI, vol. 19(7), pages 1-11, March.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:7:p:4161-:d:784442
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    References listed on IDEAS

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