From: Nocturnal CPAP improves walking capacity in COPD patients with obstructive sleep apnoea
 | Overlap syndrome |  | COPD |  |  | ||
---|---|---|---|---|---|---|---|
n = 22 |  | n = 22 | |||||
 | Baseline | With CPAP | P | Baseline | With CPAP | P | †P |
Total sleep time (minutes) | 294.3 ± 80.5 | 290.1 ± 94.9 | 0.758 | 287.8 ± 77.9 | 273.2 ± 71.7 | 0.408 | 0.760 |
Sleep efficiency (%) | 67.2 ± 12.8 | 68.6 ± 14.3 | 0.833 | 66.3 ± 14.2 | 65.2 ± 12.9 | 0.650 | 0.699 |
AHI event. h-1 | 39.2 ± 16.5 | 4.6 ± 2.9 | 0.001 | 7.5 ± 4.1* | 1.6 ± 1.4 | 0.001 | 0.001 |
ODI event. h-1 | 20.4 ± 16.2 | 3.1 ± 2.9 | 0.001 | 3.1 ± 2.2* | 0.9 ± 1.1 | 0.001 | 0.001 |
Average SaO2% | 93.3 ± 2.2 | 94.5 ± 1.7 | 0.011 | 93.8 ± 2.0 | 94.9 ± 2.1 | 0.001 | 0.866 |
Lowest SaO2% | 80.3 ± 8.8 | 89.3 ± 3.9 | 0.001 | 87.0 ± 4.6* | 90.2 ± 4.3 | 0.005 | 0.089 |
Wake% | 26.6 ± 10.3 | 21.8 ± 13.7 | 0.211 | 25.5 ± 14.2 | 26.9 ± 12.7 | 0.578 | 0.124 |
N1% | 23.0 ± 14.0 | 15.4 ± 8.9 | 0.010 | 20.3 ± 14.1 | 16.5 ± 8.7 | 0.079 | 0.296 |
N2% | 39.5 ± 12.6 | 41.2 ± 14.9 | 0.700 | 34.0 ± 11.8 | 33.2 ± 11.6 | 0.941 | 0.751 |
N3% | 2.3 ± 3.9 | 5.2 ± 6.1 | 0.001 | 7.5 ± 9.4 | 9.2 ± 11.4 | 0.235 | 0.191 |
REM% | 8.5 ± 7.1 | 16.4 ± 10.3 | 0.004 | 12.2 ± 7.7 | 13.9 ± 7.5 | 0.144 | 0.026 |
CPAP pressure (cm H2O) |  | 6.8 ± 1.8 |  |  | 4.9 ± 0.9* |  |  |