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Association of Shift Work with Normal-Weight Obesity in Community-Dwelling Adults

 Chul Woo Ahn  ;  Sungjae Shin  ;  Seunghyun Lee  ;  Hye-Sun Park  ;  Namki Hong  ;  Yumie Rhee 
 Endocrinology and Metabolism(대한내분비학회지), Vol.37(5) : 781-790, 2022-10 
Journal Title
Endocrinology and Metabolism(대한내분비학회지)
Issue Date
Adult ; Female ; Humans ; Independent Living* ; Male ; Nutrition Surveys ; Obesity / complications ; Risk Factors ; Shift Work Schedule*
Body composition ; Circadian rhythm ; Metabolic syndrome ; Obesity ; Shift work schedule
Backgruound: Shift work is associated with obesity and metabolic syndrome. However, this association in the normal-weight population remains unclear. This study aimed to investigate whether shift work is associated with normal-weight obesity (NWO).

Methods: From the nationally representative Korea National Health and Nutrition Examination Survey (KNHANES) dataset (2008 to 2011), 3,800 full-time workers aged ≥19 years with a body mass index (BMI) ≤25 kg/m2 were analysed. We defined NWO as BMI ≤25 kg/m2 and body fat percentage ≥25% in men and ≥37% in women. Working patterns were classified into "daytime," "other than daytime," and "shift." Multivariable logistic regression analysis was performed to evaluate the relationship between shift work and NWO.

Results: Shift work was associated with higher odds of NWO than daytime work (adjusted odds ratio [aOR], 1.47; 95% confidence interval [CI], 1.04 to 2.09) and night/evening work (aOR, 1.87; 95% CI, 1.11 to 3.14) after adjustment for type of work, working hours, age, sex, BMI, 25-hydroxyvitamin D levels, homeostatic model assessment for insulin resistance, and other sociodemographic factors. In subgroup analyses, the association between shift work and NWO was more robust in those aged ≥60 years and those working ≥56 hours/week.

Conclusion: Shift work was associated with NWO in community-dwelling Korean adults, independent of age, sex, BMI, and other covariates.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Microbiology (미생물학교실) > 1. Journal Papers
Yonsei Authors
Park, Hye Sun(박혜선)
Shin, Sung Jae(신성재) ORCID logo https://orcid.org/0000-0003-0854-4582
Ahn, Chul Woo(안철우) ORCID logo https://orcid.org/0000-0003-3733-7486
Rhee, Yumie(이유미) ORCID logo https://orcid.org/0000-0003-4227-5638
Hong, Nam Ki(홍남기) ORCID logo https://orcid.org/0000-0002-8246-1956
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