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Table 2 Sleepiness, fatigue, and sleep apnea in relation to heath-related quality of life

From: Fatigue and sleepiness determine respiratory quality of life among veterans evaluated for sleep apnea

  Linear regression modeling
Model 1a Model 2b
Risk factor Beta 95% CI p-value Partial R2 Total R2 Beta 95% CI p-value Partial R2 Total R2
Short Form (SF)-12 Physical Component Scale
 ESS −3.33 −3.99;−2.68 <0.01 0.06 0.09 −0.50 −1.11;0.12 0.11 <0.01 0.33
 FSS −7.56 −8.13;−7.00 <0.01 0.31 0.33 −7.37 −7.98;−6.76 <0.01 0.26
 AHI −0.11 −0.86;0.64 0.77 <0.01 0.04 0.08 −0.55;0.71 0.81 <0.01
AQ-20R Respiratory-Specific Health-Related Quality of Life
 ESS 1.62 1.39;1.86 <0.01 0.10 0.12 0.78 0.54;1.02 <0.01 0.03 0.27
 FSS 2.48 2.26;2.70 <0.01 0.24 0.25 2.18 1.94;2.41 <0.01 0.17
 AHI 0.17 −0.11;−0.45 0.23 <0.01 0.02 0.04 −0.20;0.29 0.73 <0.01
  1. All regression beta values are scaled standardized units of the independent predictors. Higher SF-12 equates with better Health-Related Quality of Life; higher AQ-20R with poorer health-related quality of life
  2. Abbreviations: AHI apnea-hypopnea index, BMI Body Mass Index, CI confidence intervals, ESS Epworth Sleepiness Scale, FSS Fatigue Severity Scale
  3. aModel 1 also includes age, sex, marital status and BMI
  4. bModel 2 includes ESS, FSS, AHI altogether in the same multivariate model, along with age, sex, marital status and BMI