Baseline characteristics
| Characteristics | Value |
| n | 569 |
| Age in years, mean (SD) range | 58 (8) 39–79 |
| Body mass index in kg/m2, mean (SD) range | 31 (7) 18–66 |
| Years to event/censor, mean (SD) range | 8 (4) 0.1–15 |
| Males, n (%) | 300 (53) |
| Apnoea–hypopnoea Index, n (%) | |
| <5 | 253 (44) |
| 5–15 | 168 (30) |
| >15 | 148 (26) |
| Diabetes, n (%) | 32 (6) |
| Hypertension, n (%) | 191 (34) |
| Stroke, n (%) | 11 (2) |
| Antihypertensive medication use (excluding Beta Blockers or any chronotropic medication), n (%) | 133 (24) |
| Smoking, n (%) | |
| Current | 63 (11) |
| Past | 213 (37) |
| Never | 293 (52) |
| White race, n (%) | 538 (97) |
| Number of alcoholic drinks per week, mean (SD) range | 4 (5) 0–32 |
| Total sleep time, minutes, mean (SD) range | 368 (61) 30–514 |
| Per cent stage 1 sleep, mean (SD) | 10.6 (6.5) |
| Per cent stage 2 sleep, mean (SD) | 65.0 (9.3) |
| Per cent stage 3, 4 sleep, mean (SD) | 7.8 (8.0) |
| Per cent REM sleep, mean (SD) | 16.6 (6.4) |
| Mean SaO2, mean (SD) | 95.4 (1.8) |
| Mean desaturation, mean (SD) | 4.5 (1.5) |
| Percentage of total sleep time below 90% saturation, mean (SD) | 2.7 (11.2) |
REM, rapid eye movement; SaO2, oxygen saturation.