Table 5 Adjusted odds ratios for obesity according to sleep duration among students in Zhejiang, China
|  | < 7 h | 7 h | 8 h | 9 h | ≥10 h |
|---|---|---|---|---|---|
Overall | |||||
 Total | 2025 | 4262 | 6279 | 3225 | 2612 |
 Obese | 74 | 119 | 184 | 124 | 119 |
  Model 1 | 1.52 (1.08–2.12) * | 1.30 (0.99–1.71) | 1.00 | 1.31 (0.99–1.73) | 1.40 (1.05–1.89) * |
  Model 2 | 1.55 (1.10–2.19) * | 1.34 (1.02–1.76) * | 1.00 | 1.30 (0.98–1.71) | 1.39 (1.03–1.88) * |
  Model 3 | 1.60 (1.14–2.23) & | 1.36 (1.03–1.78) * | 1.00 | 1.29 (0.97–1.70) | 1.39 (1.02–1.87) * |
Female | |||||
 Total | 1109 | 2394 | 3176 | 1485 | 1095 |
 Obese | 29 | 50 | 58 | 44 | 43 |
  Model 1 | 1.86 (1.08–3.22) | 1.82 (1.14–2.92) | 1.00 | 1.40 (0.87–2.24) | 2.09 (1.23–3.58) |
  Model 2 | 1.96 (1.14–3.35) * | 1.89 (1.18–3.03) & | 1.00 | 1.38 (0.87–2.19) | 2.13 (1.23–3.69) & |
  Model 3 | 1.97 (1.15–3.38) * | 1.90 (1.18–3.04) & | 1.00 | 1.38 (0.86–2.20) | 2.12 (1.22–3.67) & |
Male | |||||
 Total | 916 | 1868 | 3103 | 1740 | 1517 |
 Obese | 45 | 69 | 126 | 80 | 76 |
  Model 1 | 1.37 (0.92–2.03) | 1.07 (0.77–1.50) | 1.00 | 1.27 (0.91–1.76) | 1.13 (0.82–1.56) |
  Model 2 | 1.40 (0.93–2.10) | 1.11 (0.80–1.54) | 1.00 | 1.25 (0.90–1.74) | 1.12 (0.81–1.54) |
  Model 3 | 1.45 (0.97–2.16) | 1.13 (0.81–1.57) | 1.00 | 1.25 (0.89–1.74) | 1.12 (0.81–1.54) |