| Outcome | Change with CPAP Median (IQR) | Change with BVS Median (IQR) | p Value between-group differences |
| SF-36 | |||
| Physical functioning | 8 (−5–30) | 24 (0–35) | 0.2 |
| Role-physical | 18 (0–50) | 31 (0–50) | 0.32 |
| Bodily pain | 8 (−10–26) | 11 (0–21) | 0.51 |
| General health | 10 (−5–27) | 9 (0–16) | 0.99 |
| Vitality | 14 (−5–35) | 26 (12–45) | 0.2 |
| Social functioning | 8 (−25–25) | 23 (0–50) | 0.12 |
| Role-emotional | 4 (0–33) | 17 (0–67) | 0.5 |
| Mental health | 13 (0–28) | 7 (−8–24) | 0.75 |
| Physical combined score | 7 (−6–28) | 20 (9–34) | 0.22 |
| Mental combined score | 12 (8–19) | 21 (6–33) | 0.28 |
| Psychomotor vigilance test | |||
| Lapses | 0.6 (0–0.5) | −2 (−4–0) | 0.07 |
| Median (ms) | 9 (−16–27) | −21 (−29–0) | 0.07 |
| Mean of slowest 10% reaction times (1/rt) | 0.07 (−0.2–0.2) | 0.32 (0.05–0.5) | 0.03 |
| Trails B (s) | −21 (−34–0.5) | −2 (−20–17) | 0.1 |
| DSF | −0.3 (−1–0) | 0.35 (−1–2) | 0.16 |
| DSB | 0.08 (0–1) | 0.5 (−1–2) | 0.25 |
| DSS | 4 (0–8) | 2 (0–6) | 0.57 |
CPAP, continuous positive airway pressure; BVS, bilevel ventilatory support; DSF, digit span forward; DSB, digit span backwards; DSS, digit symbol substitution.