Korean J Fam Pract. 2018; 8(2): 299-306  https://doi.org/10.21215/kjfp.2018.8.2.299
The Association between Working Hours and the Metabolic Syndrome According to Occupation Group in over 30 Years Korean Men
Ji Young Kwak, Sang Wha Lee*, Hong Soo Lee, Kyung Won Shim, A Ri Byun, Sou Yeung Han
Department of Family Medicine, Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, Korea
Sang Wha Lee
Tel: +82-2-2650-5165, Fax: +82-2-2654-2439
E-mail: ghwa@ewha.ac.kr
ORCID: http://orcid.org/0000-0002-7451-9978
Received: April 3, 2017; Revised: September 6, 2017; Accepted: September 13, 2017; Published online: April 20, 2018.
© The Korean Academy of Family Medicine. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: We analyzed the relationship between long working hours and metabolic syndrome (MetS) in male non-manual and manual workers.
Methods: Using the Korean National Health and Nutrition Examination Survey data from the 5th to 6th period of the paid workers who were ≥30-years-old working for ≥30 hours/week were collected. Four weekly-working-hour groups of 30–39, 40–49, 50–59, and ≥60 hours/week were classified, using 40–49 hours/week group as the reference group. The relationship between working hours and MetS was evaluated for both non-manual and manual workers using multiple logistic regression analysis, after adjusting for age, smoking, drinking, exercise, final education, and sleep time. Additional stratification analysis was performed according to occupation and age.
Results: A total of 7,352 subjects were analyzed. In both non-manual and manual workers, there was no difference in the MetS incidence according to working hours. After adjustment, the odds ratios (ORs) of the MetS were not significant according to working hours in both non-manual and manual workers. In the stratification analysis, ORs were not significantly different according to working hours in groups of ≥40-year-olds and ＜40-year-olds of non-manual and manual workers, respectively, although ≥60 hours/week group showed lower ORs of MetS among ≥40-year-old service and sales workers (OR=0.534, P=0.024) and ＜40-year-old craft/plant/machine operators and assemblers (OR=0.466, P=0.037).
Conclusion: There was no increase in the risk of MetS associated with long working hours in both non-manual and manual workers.
Keywords: Metabolic Syndrome; Working Hours; Manual Worker; Non-Manual Worker
References
  1. Grundy SM. Metabolic syndrome pandemic. Arterioscler Thromb Vasc Biol 2008; 28: 629-36.
    Pubmed CrossRef
  2. Kolovou GD, Anagnostopoulou KK, Salpea KD, Mikhailidis DP. The prevalence of metabolic syndrome in various populations. Am J Med Sci 2007;333: 362-71.
    Pubmed CrossRef
  3. Park E, Choi SJ, Lee HY. The prevalence of metabolic syndrome and related risk factors based on the KNHANES V 2010. J Agric Med Community Health 2013; 38: 1-13.
    CrossRef
  4. Mottillo S, Filion KB, Genest J, Joseph L, Pilote L, Poirier P, et al. The metabolic syndrome and cardiovascular risk a systematic review and meta-analysis. J Am Coll Cardiol 2010; 56: 1113-32.
    Pubmed CrossRef
  5. Kivimäki M, Jokela M, Nyberg ST, Singh-Manoux A, Fransson EI, Alfredsson L, et al. Long working hours and risk of coronary heart disease and stroke: a systematic review and meta-analysis of published and unpublished data for 603,838 individuals. Lancet 2015; 386: 1739-46.
    CrossRef
  6. Virtanen M, Heikkilä K, Jokela M, Ferrie JE, Batty GD, Vahtera J, et al. Long working hours and coronary heart disease: a systematic review and metaanalysis. Am J Epidemiol 2012; 176: 586-96.
    Pubmed KoreaMed CrossRef
  7. Lallukka T, Laaksonen M, Martikainen P, Sarlio-Lähteenkorva S, Lahelma E. Psychosocial working conditions and weight gain among employees. Int J Obes (Lond) 2005; 29: 909-15.
    Pubmed CrossRef
  8. Yoo DH, Kang MY, Paek D, Min B, Cho SI. Effect of long working hours on self-reported hypertension among middle-aged and older wage workers. Ann Occup Environ Med 2014; 26: 25.
    Pubmed KoreaMed CrossRef
  9. Kroenke CH, Spiegelman D, Manson J, Schernhammer ES, Colditz GA, Kawachi I. Work characteristics and incidence of type 2 diabetes in women. Am J Epidemiol 2007; 165: 175-83.
    Pubmed CrossRef
  10. Kobayashi T, Suzuki E, Takao S, Doi H. Long working hours and metabolic syndrome among Japanese men: a cross-sectional study. BMC Public Health 2012; 12: 395.
    Pubmed KoreaMed CrossRef
  11. Pimenta AM, Bes-Rastrollo M, Sayon-Orea C, Gea A, Aguinaga-Ontoso E, Lopez-Iracheta R, et al. Working hours and incidence of metabolic syndrome and its components in a Mediterranean cohort: the SUN project. Eur J Public Health 2015; 25: 683-8.
    Pubmed CrossRef
  12. Kirk M, VanDenKerkhof E, Janssen I, Tranmer J. The influence of work patterns on indicators of cardiometabolic risk in female hospital employees. J Nurs Adm 2015; 45: 284-91.
    Pubmed CrossRef
  13. Jeong JU, Jeon MJ, Sakong J. The association between long working hours and the metabolic syndrome: evidences from the 5th Korean national health and nutrition examination survey of 2010 and 2012. Ann Occup Environ Med 2014; 26: 53.
    Pubmed KoreaMed CrossRef
  14. Organisation for Economic Co-operation and Development. Average annual hours actually worked per worker [Internet]. Paris: OECD [cited 2016 Dec 24].
    Available from: http://stats.oecd.org/Index.aspx?DataSetCode=ANHRS
  15. Jeong I, Rhie J, Kim I, Ryu I, Jung PK, Park YS, et al. Working hours and cardiovascular disease in Korean workers: a case-control study. J Occup Health 2014; 55: 385-91.
    Pubmed CrossRef
  16. Chung YK, Kwon YJ. Long working hours and work-related cerebro-cardiovascular disease in Korea. Ind Health 2013; 51: 552-8.
    KoreaMed CrossRef
  17. Kim CB, Kim KS. Association of work-related characteristics and hypertension among white collar workers. J Korean Soc Occup Environ Hyg 2015;25: 418-27.
    CrossRef
  18. Jang TW, Kim HR, Lee HE, Myong JP, Koo JW. Long work hours and obesity in Korean adult workers. J Occup Health 2014; 55: 359-66.
    Pubmed CrossRef
  19. Park JH. Association of working hours with metabolic syndrome among industry workers [dissertation]. Suwon: Ajou Univ.; 2014. Korean.
  20. International Diabetes Federation. The IDF consensus worldwide definition of the metabolic syndrome [Internet]. Brussels: International Diabetes Federation; 2006 [cited 2017 Mar 21].
    Available from: https://www.idf.org/e-library/consensus-statements/60-idfconsensus-worldwide-definitionof-the-metabolic-syndrome.html
  21. Korea National Statistical Office. Korean standard classification of occupations [Internet]. Daejeon: Korea National Statistical Office; 2007. [cited 2017 Mar 7].
    Available from: http://kostat.go.kr/e_book/kssc/KSCO07/EBook.htm
  22. Kivimäki M, Virtanen M, Kawachi I, Nyberg ST, Alfredsson L, Batty GD, et al. Long working hours, socioeconomic status, and the risk of incident type 2 diabetes: a meta-analysis of published and unpublished data from 222 120 individuals. Lancet Diabetes Endocrinol 2015; 3: 27-34.
    CrossRef
  23. Ye HH, Jeong JU, Jeon MJ, Sakong J. The association between shift work and the metabolic syndrome in female workers. Ann Occup Environ Med 2013;25: 33.
    Pubmed KoreaMed CrossRef
  24. Ha M, Park J. Shiftwork and metabolic risk factors of cardiovascular disease. J Occup Health 2005; 47: 89-95.
    Pubmed CrossRef

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