Odds ratio (OR) and 95% confidence interval of diabetes^* according to overtime work hours.

Abbreviations: OR, odds ratio; Ref, reference. *Defined as fasting glucose ≥126 mg/dL (7.0 mmol/l), HbA1c ≥6.5% (48 mmol/mol), or current use of anti-diabetic drug. †P for quadratic trend obtained from multiple logistic regression analysis by assigning 23, 62, 90, and 100 to categories of overtime work. ‡Model 1 adjusted for age (continuous), sex, and company in 4 companies (n = 40,861). §Model 2 adjusted for factors in model 1 and smoking status (never, past, or current) in 4 companies (n = 40,861). ||Model 3 adjusted for factors in model 2 and body mass index (kg/m2, continuous) in 4 companies (n = 40,861). ¶Model 1 adjusted for age (continuous) and sex in 1 company (n = 33,807). **Model 2 adjusted for factors in model 1 plus smoking status (never, past, or current), body mass index (kg/m2, continuous), alcohol use (non-drinker, drinker consuming >0 to <23 g, 23 to <46 g, or ≥46 g of ethanol per day), family history of diabetes (yes or no), shift work (yes or no), department (field work or non-field work), and job position (high or low) in 1 company (n = 33,807). ††Model 3 adjusted for factors in model 2 and sleep duration (<6 hours, 6 to <7 hours, or ≥7 hours per day) in 1 company (n = 33,807). ‡‡Model 4 adjusted for factors in model 3 and leisure time physical activity (<150 min or ≥150 min per week) in 1 company (n = 33,807).