Table 2 Descriptive statistics of Pittsburg Sleep Quality Index (PSQI) and chalder fatigue (CFQ) scales
Variables | Mean (SD) | Minimum | Maximum |
|---|---|---|---|
1. Pittsburg Sleep Quality Index (PSQI) global score | 8.16 (3.46) | 0 | 21 |
 Subjective sleep quality | 1.29 (0.82) | 0 | 3 |
 Sleep latency | 1.69 (0.91) | 0 | 3 |
 Sleep duration | 1.32 (0.96) | 0 | 3 |
 Habitual sleep efficiency | 0.79 (1.07) | 0 | 3 |
 Sleep disturbance | 1.49 (0.63) | 0 | 3 |
 Use of sleeping medication | 0.38 (0.72) | 0 | 3 |
 Daytime dysfunction | 1.20 (0.88) | 0 | 3 |
2. Chalder Fatigue Scale (CFQ) global score | 13.37 (7.17) | 0 | 33 |
 Physical fatigue | 9.55 (5.39) | 0 | 21 |
 Psychological fatigue | 3.82 (2.39) | 0 | 12 |