Table 2. Multilevel Logistic Regression Analyses for Associations of Sleep Timing With General Obesity and Abdominal Obesity.
| Sleep schedule | General obesity | Abdominal obesity | ||||
|---|---|---|---|---|---|---|
| No (%) | AOR (95% CI) | P value | No (%) | AOR (95% CI) | P value | |
| Bedtime | ||||||
| Daytimea | 292 (16.5) | 0.98 (0.83-1.16) | .81 | 427 (24.1) | 1.04 (0.90-1.20) | .59 |
| 8 pm-10 pm | 4496 (14.3) | 1 [Reference] | NA | 6748 (21.4) | 1 [Reference] | NA |
| 10 pm-midnight | 15 991 (19.1) | 1.08 (1.03-1.14) | .004 | 22 125 (26.4) | 1.06 (1.02-1.11) | .009 |
| Midnight-2 am | 5788 (32.3) | 1.19 (1.11-1.28) | <.001 | 6959 (38.8) | 1.19 (1.11-1.27) | <.001 |
| 2 am-6 am | 628 (36.5) | 1.35 (1.18-1.54) | <.001 | 765 (44.5) | 1.38 (1.21-1.58) | <.001 |
| Wake-up time | ||||||
| Before 4 am | 526 (20.6) | 0.91 (0.79-1.04) | .17 | 720 (28.2) | 0.89 (0.78-1.01) | .07 |
| 4 am-6 am | 7085 (18.1) | 1 [Reference] | NA | 10 015 (25.5) | 1 [Reference] | NA |
| After 6 am | 19 584 (20.6) | 1.04 (0.99-1.09) | .10 | 26 289 (27.7) | 1.01 (0.97-1.06) | .52 |
Abbreviations: AOR, adjusted odds ratio; NA, not applicable.
a
Defined as bedtime between 6 am and 8 pm.