![]() ![]() ![]() Cronbach’s alpha was ≥0.90 for total and single-item domain scores at baseline and Week 16, demonstrating excellent internal consistency reliability. Known-groups analyses indicated scores were able to differentiate between severity groups defined by Disease Activity Index for PsA (DAPSA), PsA Disease Activity Score (PASDAS), and minimal disease activity (MDA). PsAID-12 total and single-item domain scores demonstrated acceptable convergent and divergent validity against measures including the PsA Quality of Life (PsAQoL) total score (Week 16 correlation coefficients: 0.42–0.75). RESULTS: PsAID-12 completion rate was high (baseline: 99.9% Week 16: 96.2%). Psychometric performance of the total and single-item domain scores were characterized in terms of distributional properties (skewness, kurtosis, floor/ceiling effects), convergent/divergent validity, known-groups validity, internal consistency reliability, test-retest reliability, and responsiveness. Psychometric analyses were conducted on observed scores for all randomized participants with ≥1 non‑missing PsAID‑12 single‑item domain score between baseline and Week 16 (N=1,252). METHODS: Blinded data from subcutaneous bimekizumab phase 3 PsA trials (BE OPTIMAL: NCT03895203 BE COMPLETE: NCT03896581) were analyzed. OBJECTIVES: Assess the psychometric properties of the Psoriatic Arthritis (PsA) Impact of Disease-12 (PsAID-12) questionnaire total and single-item domain scores. ![]()
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