Sleep duration | Overall, N=60 569 | Weight outcomes* | ||
Underweight versus normal | Overweight versus normal | Obese versus normal | ||
n (%) | AOR† (95% CI) | AOR† (95% CI) | AOR† (95% CI) | |
Sleep duration (men) | ||||
<6 h | 4070 (14.9) | 1.16 (0.90 to 1.50) | 1.13 (1.00 to 1.28) | 1.36 (1.21 to 1.52) |
6 h | 4815 (17.6) | 0.90 (0.71 to 1.16) | 0.98 (0.88 to 1.09) | 1.16 (1.04 to 1.29) |
7 h | 5719 (20.9) | Ref | Ref | Ref |
8 h | 8664 (31.6) | 1.15 (0.94 to 1.42) | 1.06 (0.97 to 1.17) | 1.08 (0.99 to 1.19) |
≥9 h | 4139 (15.1) | 1.08 (0.84 to 1.39) | 1.03 (0.91 to 1.16) | 1.16 (1.03 to 1.30) |
Sleep duration (women) | ||||
<6 h | 4728 (14.3) | 0.97 (0.85 to 1.11) | 1.33 (1.18 to 1.51) | 1.49 (1.32 to 1.68) |
6 h | 5120 (15.4) | 0.99 (0.87 to 1.12) | 1.21 (1.07 to 1.37) | 1.28 (1.14 to 1.44) |
7 h | 6965 (21.0) | Ref | Ref | Ref |
8 h | 11 007 (33.2) | 1.05 (0.95 to 1.16) | 1.13 (1.02 to 1.25) | 1.14 (1.04 to 1.26) |
≥9 h | 5342 (16.1) | 1.21‡ (1.07 to 1.37) | 1.22 (1.07 to 1.39) | 1.36 (1.20 to 1.53) |
↵* Body mass index (BMI) categories: normal = 18.5 to <23; underweight = ≤18.5; overweight-at-risk = 23 to <25; obese = ≥25. For each ‘abnormal’ category, multinomial logistic regression compares the outcome odds to the outcome odds of a ‘normal’ BMI, with the results expressed as an Odd Ratio (OR).
↵† Adjusted ORs—covariates included age, marital status, personal income, geographical rural–urban residence, physical activity, fruit and vegetable intakes, screen time, smoking, alcohol drinking, doctor-diagnosed depression and chronic health conditions (see the Methods section).
↵‡ Bolded values indicate statistical significance at p<0.05.