Table 2

Effects of high and low CPAP and placebo use on sleepiness

High vs low useCPAP vs placeboTreatment by use interactionHigh-CPAP vs high-placebo useHigh-placebo vs low-placebo use
ESS (24 points)2.2 (1.0 to 3.3), p<0.0012.1 (1.1 to 3.0), p<0.001p=0.0563.0 (1.7 to 4.3), p<0.0011.5 (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.