Characteristics of patients participating in study
| Subtherapeutic NCPAP (n = 33) | Therapeutic NCPAP (n = 26) | p value (between groups) | |
|---|---|---|---|
| Age (years) | 50 (35 to 64) | 50 (38 to 68) | 0.86 |
| Weight (kg) | 112 (86 to 160) | 108 (82 to 141) | 0.30 |
| BMI (kg/m2) | 34.0 (27.0 to 48.4) | 32.2 (26.3 to 42.8) | 0.24 |
| Neck circumference (cm) | 44.5 (43.0 to 50.9) | 44.9 (39.5 to 50.8) | 0.46 |
| Time holding driving licence (years) | 29.5 (14.5 to 47.8) | 31.5 (11.3 to 49.8) | 0.62 |
| >4% Sao 2 (dips/h) | 34.7 (11.0 to 70.1) | 26.1 (12.6 to 55.5) | 0.22 |
| Maintenance of wakefulness test (min) | 20.2 (7.2 to 40) | 21.2 (6.3 to 37.3) | 0.75 |
| Clinic Epworth Sleepiness score (ESS) | 15 (11.2 to 20.8) | 15 (10.0 to 19.8) | 0.32 |
| SD of position on road | 0.35 (0.15 to 1.17) | 0.36 (0.15 to 1.12) | 0.92 |
| SD deterioration (SD/h) | 0.18 (–0.02 to 2.67) | 0.18 (–1.14 to 30.3) | 0.58 |
| Off-road events (no./h) | 34.8 (0.9 to 149) | 17.8 (0.4 to 149) | 0.59 |
| Length of drive (min) | 27.6 (10.9 to 30.0) | 24.8 (7.6 to 30.0) | 0.57 |
| Reaction time (s) | 2.8 (1.7 to 5.5) | 2.8 (1.8 to 4.9) | 0.59 |
Values are medians (5th to 95th centiles).