Sleep study data
| Diagnostic study | NPPV | p-value | |
| Total Sleep Time, min | 271±79 | 283±53 | NS |
| Minimum Sa,O2 % | 72±7 | 89±2 | 0.01 |
| Minimum Average Sa,O2 % | 90±2 | 94±1 | 0.001 |
| Sleep Efficiency % | 62±16 | 68±8 | NS |
| Stage 1/2 %TST | 79±7 | 72±10 | 0.057 |
| Slow wave sleep %TST | 8±6 | 12±9 | NS |
| REM %TST | 13±7 | 16±6 | NS |
| Respiratory disturbance index events·h−1 | 49±10 | 6±5 | 0.001 |
| Arousal index arousals·h−1 | 42±6 | 17±7 | 0.001 |
| Heart rate beats per minute | 73.9±9.6 | 69.3±13.1 | NS |
Data are prsented as mean±SD
PPV: Pressure preset ventilation
TST: total sleep time
Sa,O2: arterial oxyhaemoglobin saturation
mean of the 1st 30 mins nonrapid eye movement. P-Values>0.1 are expressed as not significant (NS)