Components of PSQI (n=111)
| Subjective sleep quality | ||
| Very good | 6 (5.4) | |
| Fairly good | 32 (28.8) | |
| Fairly bad | 60 (54.1) | |
| Very bad | 13 (11.7) | |
| Sleep latency (min) | ||
| ≤15 | 36 (32.4) | |
| 16–30 | 49 (44.1) | |
| 31–60 | 23 (20.7) | |
| >60 | 3 (2.7) | |
| Sleep duration (hours) | ||
| >7 | 72 (64.9) | |
| 6–7 | 20 (18.0) | |
| 5–6 | 19 (17.1) | |
| <5 | 0 (0.0) | |
| Sleep efficiency (%) | ||
| >85 | 107 (96.4) | |
| 75–84 | 4 (3.6) | |
| 65–74 | 0 (0.0) | |
| <65 | 0 (0.0) | |
| Sleep disturbances score (greater score indicates more frequent sleep disturbances) | ||
| 0 | 9 (8.1) | |
| 1 | 87 (78.4) | |
| 2 | 12 (10.8) | |
| 3 | 3 (2.7) | |
| Use of sleep medication | ||
| Not during the past month | 100 (90.1) | |
| Less than once a week | 7 (6.3) | |
| Once or twice a week | 2 (1.8) | |
| Three or more times a week | 2 (1.8) | |
| Daytime dysfunction score (higher score indicates greater daytime dysfunction) | ||
| 0 | 11 (9.9) | |
| 1 | 83 (74.8) | |
| 2 | 15 (13.5) | |
| 3 | 2 (1.8) | |
PSQI, Pittsburgh Sleep Quality Index.