Table 2.
Results of Pittsburgh sleep quality index and its components among adolescents
| Variables | Total (n=550) | Vacation (n=400) | School days (n=150) | P |
|---|---|---|---|---|
| Average time to go off to sleep (min) | 16.1±19.3 | 16.3±19.1 | 15.7±19.7 | |
| Average duration of actual sleep (h) | 8.3±1.7 | 8.5±1.8 | 7.7±1.4 | |
| Subjective sleep quality, n (%) | ||||
| Very good | 227 (41.3) | 163 (40.8) | 64 (42.7) | 0.6 |
| Fairly good | 318 (57.8) | 234 (58.5) | 84 (56.0) | |
| Fairly bad | 4 (0.7) | 2 (0.5) | 2 (1.3) | |
| Very bad | 1 (0.2) | 1 (0.3) | ||
| Sleep latency (min), n (%) | ||||
| <15 | 298 (54.2) | 233 (58.3) | 65 (43.3) | 0.02 |
| 15-30 | 139 (25.3) | 92 (23.0) | 47 (31.3) | |
| 31-60 | 83 (15.1) | 54 (13.5) | 29 (19.3) | |
| >60 | 30 (5.5) | 21 (5.3) | 9 (6.0) | |
| Sleep duration (h), n (%) | ||||
| >7 | 399 (72.6) | 296 (74.0) | 103 (65.7) | 0.06 |
| 6-7 | 52 (9.5) | 41 (10.3) | 11 (7.3) | |
| 5-6 | 92 (16.7) | 57 (14.3) | 35 (23.3) | |
| <5 | 7 (1.3) | 6 (1.5) | 1 (0.7) | |
| Habitual sleep efficiency, n (%) | ||||
| >85 | 476 (86.6) | 356 (89.0) | 120 (80.0) | 0.04 |
| 75-84 | 59 (10.7) | 34 (8.5) | 25 (16.6) | |
| 65-74 | 9 (1.6) | 6 (1.5) | 3 (2.0) | |
| <65 | 6 (1.1) | 4 (1.0) | 2 (1.3) | |
| Some sleep disturbance, n (%) | 174 (31.6) | 101 (25.3) | 73 (48.7) | 0.00 |
| Medication used for sleep, n (%) | 0 | 0 | 0 | |
| Daytime dysfunction, n (%) | 0 | 0 | 0 | |
| Global PSQI, n (%) | ||||
| ≤5 | 510 (92.7) | 374 (93.5) | 136 (90.6) | 0.2 |
| >5 | 40 (7.3) | 26 (6.5) | 14 (9.3) |
PSQI: Pittsburgh sleep quality index