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Effects of long working hours and the night shift on severe sleepiness among workers with 12-hour shift systems for 5 to 7 consecutive days in the automobile factories of Korea.
J Sleep Res. 2008 Dec; 17(4):385-94.JS

Abstract

We investigated the effects of 12-hour shift work for five to seven consecutive days and overtime on the prevalence of severe sleepiness in the automobile industry in Korea. [Correction added after online publication 28 Nov: Opening sentence of the summary has been rephrased for better clarity.] A total of 288 randomly selected male workers from two automobile factories were selected and investigated using questionnaires and sleep-wake diaries in South Korea. The prevalence of severe sleepiness at work [i.e. Karolinska Sleepiness Scale (KSS) score of 7 or higher] was modeled using marginal logistic regression and included theoretical risk factors related to working hours and potential confounding factors related to socio-economic status, work demands, and health behaviors. Factors related to working hours increased the risk for severe sleepiness at the end of the shift in the following order: the night shift [odds ratio (OR): 4.7; 95% confidence interval (CI): 3.6-6.0)], daily overtime (OR: 2.2; 95% CI: 1.7-2.9), weekly overtime (OR: 1.6; 95% CI: 1.0-2.6), and night overtime (OR: 1.6; 95% CI: 0.8-3.0). Long working hours and shift work had a significant interactive effect for severe sleepiness at work. Night shift workers who worked for 12 h or more a day were exposed to a risk of severe sleepiness that was 7.5 times greater than day shift workers who worked less than 11 h. Night shifts and long working hours were the main risk factors for severe sleepiness among automobile factory workers in Korea. Night shifts and long working hours have a high degree of interactive effects resulting in severe sleepiness at work, which highlight the need for immediate measures to address these characteristics among South Korean labor force patterns.

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Authors+Show Affiliations

Son M
Department of Preventive Medicine, Medical College, Kangwon National University, Chuncheon, South Korea.
Kong JO
No affiliation info available
Koh SB
No affiliation info available
Kim J
No affiliation info available
Härmä M
No affiliation info available

MeSH

AdultAutomobilesBody Mass IndexDisorders of Excessive SomnolenceFemaleHealth BehaviorHumansIndustryKoreaMaleMiddle AgedOccupational DiseasesPrevalenceRisk FactorsSeverity of Illness IndexSleep Disorders, Circadian RhythmSocioeconomic FactorsSurveys and QuestionnairesTime Factors

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19021859

Citation

Son, Mia, et al. "Effects of Long Working Hours and the Night Shift On Severe Sleepiness Among Workers With 12-hour Shift Systems for 5 to 7 Consecutive Days in the Automobile Factories of Korea." Journal of Sleep Research, vol. 17, no. 4, 2008, pp. 385-94.
Son M, Kong JO, Koh SB, et al. Effects of long working hours and the night shift on severe sleepiness among workers with 12-hour shift systems for 5 to 7 consecutive days in the automobile factories of Korea. J Sleep Res. 2008;17(4):385-94.
Son, M., Kong, J. O., Koh, S. B., Kim, J., & Härmä, M. (2008). Effects of long working hours and the night shift on severe sleepiness among workers with 12-hour shift systems for 5 to 7 consecutive days in the automobile factories of Korea. Journal of Sleep Research, 17(4), 385-94. https://doi.org/10.1111/j.1365-2869.2008.00675.x
Son M, et al. Effects of Long Working Hours and the Night Shift On Severe Sleepiness Among Workers With 12-hour Shift Systems for 5 to 7 Consecutive Days in the Automobile Factories of Korea. J Sleep Res. 2008;17(4):385-94. PubMed PMID: 19021859.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of long working hours and the night shift on severe sleepiness among workers with 12-hour shift systems for 5 to 7 consecutive days in the automobile factories of Korea. AU - Son,Mia, AU - Kong,Jeong-Ok, AU - Koh,Sang-Baek, AU - Kim,Jaeyoung, AU - Härmä,Mikko, Y1 - 2008/10/08/ PY - 2008/11/22/pubmed PY - 2009/4/29/medline PY - 2008/11/22/entrez SP - 385 EP - 94 JF - Journal of sleep research JO - J Sleep Res VL - 17 IS - 4 N2 - We investigated the effects of 12-hour shift work for five to seven consecutive days and overtime on the prevalence of severe sleepiness in the automobile industry in Korea. [Correction added after online publication 28 Nov: Opening sentence of the summary has been rephrased for better clarity.] A total of 288 randomly selected male workers from two automobile factories were selected and investigated using questionnaires and sleep-wake diaries in South Korea. The prevalence of severe sleepiness at work [i.e. Karolinska Sleepiness Scale (KSS) score of 7 or higher] was modeled using marginal logistic regression and included theoretical risk factors related to working hours and potential confounding factors related to socio-economic status, work demands, and health behaviors. Factors related to working hours increased the risk for severe sleepiness at the end of the shift in the following order: the night shift [odds ratio (OR): 4.7; 95% confidence interval (CI): 3.6-6.0)], daily overtime (OR: 2.2; 95% CI: 1.7-2.9), weekly overtime (OR: 1.6; 95% CI: 1.0-2.6), and night overtime (OR: 1.6; 95% CI: 0.8-3.0). Long working hours and shift work had a significant interactive effect for severe sleepiness at work. Night shift workers who worked for 12 h or more a day were exposed to a risk of severe sleepiness that was 7.5 times greater than day shift workers who worked less than 11 h. Night shifts and long working hours were the main risk factors for severe sleepiness among automobile factory workers in Korea. Night shifts and long working hours have a high degree of interactive effects resulting in severe sleepiness at work, which highlight the need for immediate measures to address these characteristics among South Korean labor force patterns. SN - 1365-2869 UR - https://www.unboundmedicine.com/medline/citation/19021859/Effects_of_long_working_hours_and_the_night_shift_on_severe_sleepiness_among_workers_with_12_hour_shift_systems_for_5_to_7_consecutive_days_in_the_automobile_factories_of_Korea_ L2 - https://doi.org/10.1111/j.1365-2869.2008.00675.x DB - PRIME DP - Unbound Medicine ER -