| Total(n = 783) | AHI 0–5(n = 140) | AHI 6–15(n = 235) | AHI 16–30(n = 206) | AHI >30(n = 202) | |
| Age (years) | 49.9 (11.6) | 46.9 (11.2) | 49.7 (11.0) | 49.6 (11.4) | 52.7 (12.3) |
| BMI (kg/m2) | 31.8 (10.3) | 31.2 (19.9) | 31.1 (6.4) | 31.4 (6.4) | 33.1 (7.7) |
| Sex (% male) | 71.1 | 59.7 | 66.5 | 72.3 | 82.8 |
| AHI | 22.6 (21.9) | 2.4 (1.5) | 9.8 (2.9) | 21.4 (4.2) | 53.6 (20.9) |
| ESS | 10.1 (5.2) | 10.2 (5.1) | 9.9 (5.3) | 9.3 (5.1) | 10.9 (5.2) |
| km/week driven | 234.3 (208.3) | 195.3 (201.9) | 237.7 (211.2) | 223.3 (201.7) | 266.6 (206.9) |
AHI, apnoea-hypopnoea index; BMI, body mass index; ESS, Epworth Sleepiness Scale.