Table 2.
Sleep time habits according to BMI category (N=1586).
| Under/Normal weight N=755 | Overweight N=442 | Obese N=389 | P | |
|---|---|---|---|---|
| Sleep quantity, hh | ||||
| Total sleep time | 9.0±1.3 | 8.5±1.2a | 8.5±1.6a | <0.001 |
| Weekdays time | 8.3±1.1 | 7.9±1.0a | 7.8±1.1a | <0.001 |
| Weekend sleep time | 10.0±1.5 | 9.8±1.8 | 9.9±1.9 | 0.778 |
| Nap time on weekdays | 1.5±0.8 | 1.4±0.7 | 1.4±0.7 | 0.645 |
| Nap time on weekend | 1.6±0.9 | 1.5±0.8 | 1.6±0.7 | 0.792 |
| Sleep quality | ||||
| PDSS score | 13.3±6.3 | 14.5±5.9a | 14.7±6.7a | 0.001 |
| Bedtimes weekdays | 0.256 | |||
| <21:00 | 29 (3.8) | 18 (4.1) | 13 (3.3) | |
| 21:00–22:00 | 131 (17.4) | 69 (15.6) | 38 (9.8) | |
| 22:01–23:00 | 483 (64.0) | 260 (58.8) | 263 (67.6) | |
| >23:00 | 112 (14.8) | 95 (21.5) | 75 (19.3) | |
| Wake times weekdays | 0.544 | |||
| <7:00 | 208 (27.5) | 145 (32.8) | 121 (31.1) | |
| 7:00–7:30 | 371 (49.1) | 209 (47.3) | 188 (48.3) | |
| >7:30 | 176 (23.3) | 88 (19.9) | 80 (20.6) | |
| Bedtimes weekend | 0.195 | |||
| <22:00 | 120 (15.9) | 64 (14.5) | 56 (14.4) | |
| 22:00–23:00 | 264 (35.0) | 145 (32.8) | 131 (33.7) | |
| 23:01–24:00 | 255 (33.8) | 149 (33.7) | 136 (35.0) | |
| >24:00 | 116 (15.4) | 84 (19.0) | 66 (17.0) | |
| Wake times weekend | 0.432 | |||
| <9:00 | 109 (14.4) | 84 (19.0) | 99 (25.4) | |
| 9:00–10:00 | 274 (36.3) | 132 (29.9) | 95 (24.4) | |
| >10:00 | 372 (49.3) | 226 (51.1) | 195 (50.1) | |
| Nap on weekdays, yes | 198 (26.2) | 121 (27.3) | 101 (25.9) | 0.678 |
| Nap on weekend, yes | 207 (27.4) | 122 (27.7) | 103 (26.5) | 0.746 |
Data are presented as number (%) or mean±SD; ANOVA was used to compare sleep quantity and quality; χ2 for all others variables;
a
Significantly different from Under/ Normal weight (P<0.05); Hh, hours; PDSS, Pediatric Daytime Sleepiness Scale.