Effects of high and low CPAP and placebo use on sleepiness
| High vs low use | CPAP vs placebo | Treatment by use interaction | High-CPAP vs high-placebo use | High-placebo vs low-placebo use | |
| ESS (24 points) | 2.2 (1.0 to 3.3), p<0.001 | 2.1 (1.1 to 3.0), p<0.001 | p=0.056 | 3.0 (1.7 to 4.3), p<0.001 | 1.5 (0.1 to 2.8), p=0.03 |
Data are presented as mean points of improvement from baseline (95% CI), p value. The effects of compliance, treatment and the interaction between treatment and compliance are presented. The compliance effect tests whether high use is better than low use; the treatment effect tests whether CPAP was better than placebo; and the interaction tests whether the effect of high use differs between CPAP and placebo.
CPAP, continuous positive airway pressure; ESS, Epworth Sleepiness Scale.