Table 2.
Sleep study
| All patients (n = 112) |
Survivors (n = 80) |
Non-survivors (n = 32) |
P-value | |
|---|---|---|---|---|
| AHI, /h | 21±13 | 20±11 | 25±15 | 0.11 |
| OAHI, /h | 1.6±2.2 | 1.5±2.2 | 1.7±2.4 | 0.65 |
| CAI, /h | 18±12 | 16±10 | 20±11 | 0.16 |
| 3%ODI, /h | 17±8.4 | 16±6.6 | 20±11 | 0.06 |
| 4%ODI, /h | 13±8.1 | 12±5.9 | 17±11 | 0.045 |
| Mean SpO2, % | 96±2.2 | 96±2.1 | 95±2.2 | 0.003 |
| Minimum SpO2, % | 79±5.0 | 79±5.2 | 79±4.8 | 0.94 |
| SD SpO2, % | 2.5±0.9 | 2.4±0.8 | 2.7±1.1 | 0.15 |
| T90%, % | 5.3±11 | 4.0±9.8 | 8.7±13 | 0.06 |
| AUT90%, % | 0.2±0.5 | 0.15±0.5 | 0.3±0.6 | 0.18 |
| 3%AOD, % | 0.18±0.2 | 0.16±0.2 | 0.26±0.3 | 0.08 |
| 4%AOD, % | 0.1±0.1 | 0.08±0.1 | 0.15±0.2 | 0.11 |
| 3%POD, % | 23±14 | 19±11 | 30±18 | 0.002 |
| 4%POD, % | 14±9.4 | 11±6.4 | 19±13 | 0.001 |
AHI: apnea-hypopnea index, OAHI: obstructive apnea-hypopnea index, CAI: central apnea-hypopnea index, SD SpO2: standard deviation of SpO2 during sleep, T90%, proportion of the sleep time with an arterial oxygen saturation of <90%. AUT90%: area under T90%, ODI: oxygen desaturation index, AOD: area under oxygen desaturation events, POD: percentage of oxygen desaturation events.