Abstract
There are no updated, valid knowledge measures for adolescents with cystic fibrosis (CF). This study assessed the psychometric properties of the Knowledge of Disease Management-CF (KDM-CF). Participants (n = 266 age 11–20 years; 50% female) completed the KDM-CF. Items were examined based on floor/ceiling thresholds, clinical relevance, and correlation with its subscale. Item difficulty and discrimination, subscale structure, reliability, and convergent and discriminant validity were also examined. Two subscales were identified, Self-Management (12 items, M = 67.58, SD = 22.44) and Treatment Information (11 items, M = 65.69, SD = 22.22), in addition to Total Knowledge (M = 66.67, SD = 18.56). The KDM-CF demonstrated good subscale structure and internal consistency (α = 0.68–0.78). Convergent validity was found for age (older; β = 2.836–3.593); discriminant validity was found for gender (females had higher scores; F(1) = 4.945–6.47). The KDM-CF demonstrated adequate reliability and validity, good scale structure, good item difficulty and discrimination, and revealed knowledge deficits. The KDM-CF can be used to identify and remediate knowledge gaps in adolescents with CF.
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