Patient characteristics across the three trials
| Trial 1 (Marshall et al)9 | Trial 2 (Coughlin et al)11 | Trial 3 (Phillips et al)10 | |
| Gender (women) | 7/29 (24%) | 0/34 (0%) | 3/28 (11%) |
| Age, median (years) | 50.6 (range 25–67) | 49.0 (SD 8.3) | 48.8 (range 25–72) |
| Apnoea hypopnoea index (SD) | 21.6 (7.5) | 39.7 (13.8) | 38.68 (24.04) |
| Body mass index (kg/m2) (SD) | 31.5 (6.0) | 36.1 (7.6) | 31.7 (4.1) |
| Baseline Epworth score (SD) | 12.5 (4.1) | 13.8 (4.9) | 10.3 (4.8) |
| Prescribed CPAP pressure (cm H2O) | 7 (range 5–10) | 10.0 (IQR 8–10) | 11 (range 7–18.5) |
CPAP, continuous positive airway pressure.