Fig. 1
Multiple Regression Modelling of Sleepiness and Fatigue in Relation to Respiratory-Specific Health-Related Quality of Life (AQ-20R) Stratified by the Presence or Absence of Moderate to Severe Sleep Apnea or Obesity.
Regression beta values and associated 95% confidence intervals are shown. Predictors are shown with their partial R2 in brackets. Abbreviations: ESS (Epworth Sleepiness Scale), FSS (Fatigue Severity Scale), OSA (obstructive sleep apnea). None or mild obstructive sleep apnea defined as an apnea-hypopnea index <15 events per hour. Moderate or severe obstructive sleep apnea defined as an apnea-hypopnea index ≥15 events per hour. Obesity defined as a body mass index ≥ 30 kg/m2. All multivariate models include age, sex, marital status, and body mass index, as well as the ESS and FSS scales. All regression beta values are scaled in standardized units of the independent predictors. All beta coefficients p < 0.001. Overall model R2 values are: none-mild OSA, 0.28; moderate to severe OSA, 0.26; not obese, 0.27; obese, 0.26