Table 1 Comparison of respiratory events and blood gases analysis before and after the O2 therapy night in the efficiency group
| PSG night without O2 | PSG night under O2 therapy | Statistical significance | |
| AHI | 25.00 (SEM=3.82) | 5.12 (SEM=1.97) | P=0.002 |
| T90% | 28.00 (SEM=11.79) | 0.74 (SEM=0.26) | P<0.0001 |
| ARI | 35.57 (SEM=7.62) | 26.75 (SEM=5.14) | P=0.10 |
| pH | 7.430 (SEM=0.009) | 7.410 (SEM=0.009) | P=0.05 |
| PaO2 | 55.67 (SEM=0.91) | 78.67 (SEM=3.57) | P<0.0001 |
| PaCO2 | 38.22 (SEM=1.19) | 40.44 (SEM=3.70) | P=0.05 |
T90%=mean percent time with O2 saturation<90%, ARI= arousal index