Table 1.
Baseline characteristics
| Age, spirometry, and QoL on enrollment (mean ± SD) | PSQI <5 on enrollment (n=513) | PSQI >5 on enrollment (n=581) |
|---|---|---|
| Age | 66.6±8.2 | 63.9±8.8* |
| FEV1 (% predicted) | 38.96±15.56 | 40.04±15.59 (NS) |
| FEV1/FVC (%) | 41.8±12.5 | 43.1±12.9 (NS) |
| SGRQ global score | 44.4±14.9 | 55.7±15.7* |
| SF-36 domains 1–8 | ||
| Physical function | 42.2±24.0 | 32.6±22.6* |
| Role physical | 44.1±39.9 | 26.4±36.1* |
| Role emotional | 77.1±36.5 | 60.8±42.7* |
| Vitality | 54.7±20.7 | 41.5±18.8* |
| Emotional well | 81.0±14.7 | 69.8±19.4* |
| Social function | 79.0±22.6 | 62.8±27.3* |
| Pain | 77.4±23.0 | 62.1±27.4* |
| General health | 45.6±21.6 | 35.1±18.7* |
Note:
*
P<0.0001.
Abbreviations: PSQI, Pittsburgh Sleep Quality Index; FEV1, forced expired volume in one second; FVC, forced vital capacity; NS, not statistically significant; QoL, quality of life; SGRQ, St George’s Respiratory Questionnaire (lung disease-specific quality of life); SF-36, Medical Outcomes Short Form 36 (general quality of life); SD, standard deviation.