Patient-reported outcome measure for obstructive sleep apnea: Symptoms, Tiredness, Alertness, Mood and Psychosocial questionnaire: Preliminary results

Abstract

Obstructive sleep apnea (OSA) is a common chronic condition that has a significant impact on the biopsychosocial aspects of the patient's life. There is currently no psychometrically validated patient-reported outcome measure to assess the impact of this condition on the health-related quality of life. We designed a novel instrument based on common patient statements, prioritized by patient preference. Sixty-three patients with OSA and 33 participants with no symptoms of sleep-disordered breathing were asked to complete a 20-item initial questionnaire. The acceptability, reliability and validity of the instrument were assessed using known psychometric techniques. The instrument had strong acceptability and was completed within 180 s with no missing data. Five items were removed as they had a high ceiling factor. A further three items were removed as they did not represent the central construct uniquely. The final 12-item instrument had high internal consistency (Cronbach's alpha 0.91), strong test–retest reliability (p =.83) and high discriminant validity when comparing mean total scores of controls (6.88; 95% confidence interval [CI], 4.67–9.08) and those with OSA (31.39; 95% CI, 27.94–34.84) (p