Table 2 Measurements of COPD based on the 2007 GOLD classification
From: Factors responsible for poor sleep quality in patients with chronic obstructive pulmonary disease
| GOLD Stage 1 | GOLD Stage 2 | GOLD Stage 3 | GOLD Stage 4 | P-value | |
|---|---|---|---|---|---|
| N = 68 | N = 161 | N = 123 | N = 25 | ||
| MMRC, mean ± SD | 1.50 ± 0.76 | 1.78 ± 0.75 | 1.96 ± 0.95 | 2.33 ± 1.09 | <0.001 |
| CAT, mean ± SD | 9.15 ± 6.91 | 9.53 ± 6.35 | 11.07 ± 7.11 | 16.83 ± 8.29 | <0.001 |
| PSQI score, mean ± SD | 6.54 ± 3.57 | 6.43 ± 3.50 | 6.33 ± 3.66 | 6.44 ± 3.16 | 0.970 |
| PSQI >5, n (%) | 36 (52.9) | 85 (52.8) | 64 (52.0) | 15 (60.0) | 0.910 |
