Steering, reactions, sleepiness, and NCPAP use before and after therapeutic and subtherapeutic NCPAP
| Median (5th to 95th centiles) | Pre and post subtherapeutic NCPAP | p value sub-therapeuticpre/post | Pre and post therapeutic NCPAP |
p value therapeuticpre/post |
p value sub-therapeutic/ therapeuticpost/post | Difference subtherapeutic | Difference therapeutic | p value (subtherapeutic/ therapeutic differences) | ||
| SD of position on road |
0.35
(0.15 to 1.17) |
0.30
(0.14 to 1.19) | 0.73 | 0.36 (0.15 to 1.12) |
0.21
(0.14 to 0.63) | 0.001 | 0.08 | –0.05 (–0.53 to 0.68) |
–0.12
(–0.93 to 0.06) | 0.03 |
| SD deterioration (SD/h) |
0.18
(–0.02 to 2.67) |
0.24
(–0.04 to 2.64) | 0.47 | 0.18 (–1.14 to 30.3) |
0.06
(–1.02 to 0.40) | 0.03 | 0.007 | 0.05 (–1.64 to 2.03) |
–0.10
(–30.3 to 1.41) | 0.04 |
| Off-road events (no./h) |
34.8
(0.9 to 149) |
23.0
(0 to 150) | 0.05 | 17.8 (0.4 to 149) |
9.0
(0.0 to 76) | 0.004 | 0.07 | –6.9 (–57 to 80) |
–10.8
(–96 to 13.8) | 0.27 |
| Length of drive (min) |
27.6
(10.9 to 30.0) |
26.9
(9.1 to 30.0) | 0.29 | 24.8 (7.6 to 30.0) |
30.0
(17.6 to 30.0) | 0.03 | 0.08 | 0.0 (–11.6 to 10.3) |
2.5
(–5.8 to 14.5) | 0.02 |
| Reaction time (s) |
2.8
(1.7 to 5.5) |
2.7
(1.6 to 4.0) | 0.11 | 2.8 (1.8 to 4.9) |
2.3
(1.5 to 3.5) | <0.0001 | 0.04 | –0.19 (–2.60 to 0.93) |
–0.37
(–1.81 to 0.07) | 0.07 |
| ESS |
15.0
(11.2 to 20.8) | 13.0
(4.6 to 19.4) | 0.001 | 15.0 (10.0 to 19.8) |
5.5
(1.0 to) 13.5 | <0.0001 | <0.0001 | –3.0 (–11.8 to 1.8) |
–9.0
(–16.8 to –2.0) | 0.0006 |
| MWT (min) |
20.2
(7.2 to 40) |
24.2
(7.6 to 40) | 0.83 | 21.2 (6.3 to 37.3) |
33.5
(13.0 to 40) | 0.001 | 0.01 | 0.0 (–9.9 to 15.6) |
7.1
(–5.0 to 28.5) | 0.003 |
| NCPAP use (h) | _ |
5.0
(1.2 to 8.5) | _ | _ |
5.6
(3.0 to 7.2) | _ | 0.2 | _ | _ | _ |
ESS = Epworth Sleepiness Score; MWT = Maintenance of Wakefulness Test; NCPAP = nasal continuous positive airway pressure.