Table 2.
Mean global and component PSQI scores.
| Variables | Mean (SD) | n (%) | Range |
|---|---|---|---|
| Subjective sleep quality | 1.40 (0.76) | ||
| Very good | 33 (8.4) | ||
| Fairly good | 202 (51.4) | ||
| Fairly poor | 122 (31.0) | ||
| Very poor | 36 (9.2) | ||
| Sleep latency (minutes) | 1.58 (0.93) | ||
| ≤15 | 53 (13.5) | ||
| 16–30 | 129 (32.8) | ||
| 31–60 | 137 (34.9) | ||
| >60 | 74 (18.8) | ||
| Sleep duration (hours) | 1.56 (1.03) | ||
| >7 | 67 (17.0) | ||
| >6–7 | 132 (33.6) | ||
| 5–6 | 98 (24.9) | ||
| <5 | 96 (24.4) | ||
| Sleep efficiency (%) | 2.91 (0.39) | ||
| >85 | 6 (1.5) | ||
| 75~84 | 11 (2.9) | ||
| <65 | 376 (95.6) | ||
| Sleep disturbance # | 1.32 (0.56) | ||
| Never | 11 (2.8) | ||
| Once or twice | 253 (64.4) | ||
| Once or twice each week | 119 (30.3) | ||
| Three or more times each week | 10 (2.5) | ||
| Use of sleep medication | 0.27 (0.69) | ||
| Not during the past month | 329 (83.7) | ||
| Less than once a week | 33 (8.4) | ||
| Once or twice a week | 17 (4.3) | ||
| Three or more times a week | 14 (3.6) | ||
| Daytime dysfunction | 1.22 (0.79) | ||
| 0 | 67 (17.0) | ||
| 1–2 | 193 (49.1) | ||
| 3–4 | 110 (28.0) | ||
| Above 3 | 23 (5.9) | ||
| PSQI global score | 10.20 (2.85) | 0–21 | |
| Proportion of good sleepers (global score < 5) | 16 (4.1) | ||
| Proportion of poor sleepers (global score ≥ 5) | 377 (95.9) | ||
PSQI: Pittsburgh Sleep Quality Index; SD: standard deviation; # difficulty falling asleep.