Table 4.
Subjective sleep quality (mean ± SD) estimated by the Pittsburgh Sleep Quality Index (PSQI).
| WP (n = 344) |
RW (n = 639) |
NW (n = 976) |
|
|---|---|---|---|
| Quality of sleep (Global PSQI Score) (AU) | 8.21 ± 2.78 | 8.19 ± 4.30 | 8.26 ± 2.64 |
| Component 1: subjective sleep quality (AU) | 1.33 ± 0.85 | 1.24 ± 0.89 | 1.28 ± 0.86 |
| Component 2: sleep latency (AU) | 1.34 ± 1.03 | 1.27 ± 0.99 | 1.38 ± 1.03 * |
| Component 3: sleep duration (AU) | 2.63 ± 0.95 | 2.66 ± 0.89 | 2.59 ± 0.99 |
| Component 4: habitual sleep efficiency (AU) | 0.80 ± 1.20 | 1.11 ± 4.62 | 0.99 ± 3.21 |
| Component 5: sleep disturbances (AU) | 0.95 ± 0.21 | 0.94 ± 0.23 | 0.96 ± 0.19 |
| Component 6: use of sleeping medications (AU) | 0.24 ± 0.71 | 0.27 ± 0.73 | 0.19 ± 0.62 * |
| Component 7: daytime dysfunction over the last month (AU) | 1.03 ± 0.88 | 1.10 ± 0.86 | 1.12 ± 0.87 |
*: Significant difference between RW and NW. AU: arbitrary units.