Table 4.
Sleep (PSQI Scores) at 1 Month After Baseline, for Total Study Population and by Subgroup
| Measure | Total (n=359) | Chronic Course | Fast Recovery | Slow Recovery | Recurrent Fatigue | PValuea |
| PSQI score | ||||||
| Total, mean (SD) | 7.23 (3.55) | 9.17 (3.96) | 4.60 (2.19) | 7.53 (3.23) | 6.48 (3.15) | <.001 |
| No. (%) with score >5 | 229 (62) | 64 (82) | 9 (21) | 63 (70) | 50 (55) | |
| Sleep quality | ||||||
| Reasonably well, % | 63 | 53 | 82 | 57 | 70 | <.001b |
| Very well, % | 5.5 | 3.8 | 11 | 5.6 | 4.4 | |
| Time awake before sleeping | ||||||
| Mean (SD), minutes | 30 (31) | 36 (38) | 18 (14) | 31 (30) | 26 (24) | <.01 |
| >30 minutes, % | 26 | 37 | 9.3 | 27 | 19 | |
| Sleep duration | ||||||
| Mean (SD), hours | 7.10 (1.34) | 6.64 (1.36) | 7.33 (1.03) | 7.15 (1.41) | 7.18 (1.22) | <.05 |
| >6 hours, % | 88 | 75 | 98 | 89 | 90 | |
| Sleep efficiencyc | ||||||
| Mean (SD), % | 84 (16) | 78 (16) | 89 (10) | 84 (16) | 85 (18) | <.01 |
| >85%, % | 53 | 41 | 67 | 48 | 54 | |
| Use sleep medication, % | 20 | 29 | 4.5 | 22 | 19 | <.05 |
PSQI = Pittsburgh Sleep Questionnaire Inventory.
Note: to enable a more straightforward interpretation, component scores are not presented.
a For difference between groups, determined by analysis of variance.
b For well (reasonably well and very well) vs bad.
c Sleep time as a percentage of total bedtime.