| Parameter | Baseline | 3 months | p-value | 12 months | p-value |
| Sleep-disordered breathing | |||||
| AHI events·h−1 | 45.2±17.8 | 21.7±19.9 | <0.001 | 21.0±16.5 | <0.001 |
| Micro-arousals events·h−1 | 36.8±12.5 | 24.9±14.4 | <0.001 | 24.9±13.7 | 0.001 |
| Oxygen desaturation index events·h−1 | 29.2±19.6 | 14.2±16.7 | <0.001 | 15.3±16.2 | 0.001 |
| Sleep architecture | |||||
| TST min | 413.5±85.1 | 401.7±104.9 | 0.652 | 406.3±60.2 | 0.784 |
| Sleep efficiency % | 69.8±11.4 | 77.2±14.6 | 0.037 | 72.4±9.9 | 0.446 |
| Stage 1 NREM sleep % TST | 10.6±6.1 | 8.4±4.5 | 0.190 | 8.7±7.1 | 0.467 |
| Stage 2 NREM sleep % TST | 67.2±7 | 67.8±8.1 | 0.766 | 64.5±12 | 0.478 |
| Stages 3–4 NREM sleep % TST | 5.2±5.6 | 7.2±5.3 | 0.243 | 9.2±9.1 | 0.188 |
| Stage REM % TST | 17.2±5.6 | 16.7±6.2 | 0.804 | 17.9±5.6 | 0.731 |
Data are presented as mean±sd, unless otherwise stated. AHI: aponoea/hypopnoea index; TST: total sleep time; NREM: nonrapid eye movement; REM: rapid eye movement.