FIGURE 3.

Epworth Sleepiness Scale (ESS) scores. Unadjusted mean (95% CI) ESS scores by treatment group and sex, highlighting the difference between females and males in treatment response. A decrease in score indicates improvement. Statistical analysis of the continuous positive airway pressure (CPAP) group showed that females had a greater reduction in sleepiness than males, as measured by the ESS (mean change −4.1 (95% CI −5.1– −3.0) versus −2.5 (95% CI −3.1– −1.8); p=0.0153), after adjustments for baseline ESS score and average daily usage (table 4).