Table 4.

Descriptive statistics and Effect Sizes for Outcome Variables by Treatment Group (Active and Sham-CPAP) and Time Point

Variables Mean ± SD	CPAP Baseline n=12	Sham-CPAP baseline n=11	CPAP After 4-wks n=12	Sham-CPAP After 4-wks n=11	Effect Size (Cohen's d)
Objective and Subjective Sleep
Apnea + hypopnea index*	50.15±30.9	26.52±11.2	6.98±6.2	21.20±14.6	−1.67
Epworth Sleepiness Scale	11.42±4.62	10.55±3.72	9.08±5.70	10.50±3.62	−0.76
Pittsburgh Sleep Quality Index: Global Score	9.58±3.06	9.27±5.42	7.33±3.92	9.60±3.53	−0.62
Activity
Steps Walked	5892±3841	6071±2714	6284±3480	6684±2509	0.24
POMS Vigor-Activity Subscale	15.08±5.16	17.45±7.02	16.75±6.63	16.80±6.29	0.57
POMS Fatigue-Inertia Subscale	11.75±4.33	9.36±6.04	9.08±6.19	10.70±5.23	−0.72
FOSQ Activity Level	3.15±.55	3.21±.73	3.32±.51	2.99±.91	0.86

Effect Size = standardized mean differences (e.g., Cohen's d) in change scores between CPAP baseline and after 4-weeks compared to sham-CPAP baseline and after 4-weeks. .