Notes. SEMSA domain scores reported as group mean scores with standard errors by protocol measurement period. Effect sizes, Cohen’s d, between-group comparisons by SEMSA outcome at each protocol measurement interval. Linear trend lines by group, Blue = usual care; Red = tailored intervention. Abbreviations – SEMSA, Self-efficacy Measure in Sleep Apnea; PSG, polysomnogram; d, Cohen’s d effect size; PAP, Positive Airway Pressure