Demographic data of subjects and comparison with all patients attending for sleep studies during study period
| Study group1-150 | All patients attending for sleep studies in 6 month period1-150 | p value | |
| Age (years) | 49.8 (10.7) | 45 (21) | 0.39 (NS) |
| Sex (% men) | 82.7** | 81.9** | 0.25 (NS) |
| BMI (kg/m2) | 32.9 (6.9) | 32.9 (8.7) | 0.81 (NS) |
| RDI (events/h) | 26.1 (26.3) | 21 (23.4) | 0.12 (NS) |
| Epworth score | 12 (7–17)*** | 13 (8–16)*** | 0.39 (NS) |
| Neck circumference (cm) | 43.6 (5) | 43.3 (4.9) | 0.71 (NS) |
BMI = body mass index; RDI = respiratory disturbance index.
↵1-150 All values are mean (SD) except ** which are percentage and *** which are median (IQR).