Table 2. Baseline Sleep Characteristics .
| Characteristic | Intervention Group | Control Group |
|---|---|---|
| Reported by Interview | ||
| No. | 298 | 288 |
| Sleep duration, mean (SD), h | ||
| Total | 12.18 (1.53) | 12.27 (1.45) |
| Daytime | 4.13 (1.53) | 4.32 (1.35) |
| Nighttime | 8.05 (1.28) | 7.97 (1.22) |
| Nocturnal awakenings, median (IQR), No. | 1.0 (0-2.0) | 1.0 (1.0-2.0) |
| Nocturnal wake time duration, median (IQR), ha | 1.50 (1.00-2.00) | 1.42 (0.50-2.00) |
| Reported by Diaryb | ||
| No. | 278 | 258 |
| Sleep duration, mean (SD), h | ||
| Total | 12.70 (02.63) | 12.78 (2.17) |
| Daytime | 3.22 (1.22) | 3.23 (1.12) |
| Nighttime | 9.47 (2.37) | 9.53 (2.07) |
| Nocturnal awakenings, median (IQR), No. | 2.0 (1.3-2.7) | 2.0 (1.3-3.0) |
| Reported by Actigraphyb | ||
| No. | 229 | 230 |
| Sleep duration, mean (SD), h | ||
| Total | 11.22 (1.73) | 10.98 (1.53) |
| Daytime | 3.12 (0.88) | 3.00 (0.78) |
| Nighttime | 8.13 (1.53) | 8.03 (1.48) |
| Nocturnal awakenings, median (IQR), No. | 3.0 (2.3-4.0) | 3.3 (2.5-4.0) |
| Nocturnal wake time duration, median (IQR), ha | 1.20 (0.50-2.33) | 1.22 (0.60-2.27) |
Abbreviation: IQR, interquartile range.
a
Nocturnal wake time defined as from 22:00 to 06:00.
b
Reported as a mean of 3 days.