Table 2.
Respiratory characteristics at baseline.
| Characteristics |
Control
(n = 120) |
ASV
(n = 119) |
p-value |
|---|---|---|---|
| AHI, events/h TST | 39.2 ± 14.6 | 38.8 ± 14.6 | 0.821 |
| Apnoea index, events/h TST | 23.7 ± 18.3 | 22.6 ± 17.7 | 0.620 |
| cAHI, % of AHI | 79.4 ± 16.5 | 77.5 ± 16.0 | 0.381 |
| Oxygen desaturation index‡ | 34.6 ± 19.8 | 33.6 ± 18.4 | 0.696 |
| events/h TST | |||
| Oxygen saturation, % | |||
| Mean | 93 ± 2 | 93 ± 2 | 0.726 |
| Minimum | 81 ± 8 | 81 ± 7 | 0.938 |
| Time with oxygen | 18 [4; 66] | 23 [5; 62] | 0.796 |
| saturation <90%, min | |||
| CSR, n (%) | 109 (91) | 109 (92) | 0.835 |
| CSR proportion of TRT* | 0.692 | ||
| <20% | 27 (25) | 30 (28) | |
| 20–49 | 41 (38) | 44 (40) | |
| >49 | 41 (38) | 35 (32) |
Data are expressed as number of patients (%), mean ± standard deviation, or median [interquartile range]. AHI, apnoea-hypopnoea index; ASV, adaptive servo-ventilation; TST, total sleeping time; TRT, total recording time; cAHI, central apnoea-hypopnoea index; CSR, Cheyne Stokes respiration
*Values are rounded.
Data were missing for the following characteristics: time with an oxygen saturation of <90% for 1 in the ASV-group.
The oxygen desaturation index is the number of times that the blood oxygen level drops by ≥3 percentage points from baseline per hour of recording time.