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Table 2 Internal consistency reliability of FACIT-Fatigue in patients with PsA

From: RETRACTED ARTICLE: Content validity and psychometric evaluation of Functional Assessment of Chronic Illness Therapy-Fatigue in patients with psoriatic arthritis

  Cronbach’s Coefficient α Corrected item-to-total correlations, range
PD1: OPAL Beyond baseline data pooled with OPAL Broaden Month 12
 FACIT-Fatigue total score (N = 760) 0.95 0.46–0.89
 FACIT-Fatigue Experience domain (N = 763) 0.93 0.59–0.89
 FACIT-Fatigue Impact domain (N = 762) 0.91 0.44–0.85
PD2: OPAL Broaden baseline data pooled with OPAL Beyond Month 6
 FACIT-Fatigue total score (N = 766) 0.94 0.44–0.89
 FACIT-Fatigue Experience domain (N = 768) 0.91 0.53–0.86
 FACIT-Fatigue Impact domain (N = 768) 0.90 0.42–0.83
  1. FACIT-Fatigue Functional Assessment of Chronic Illness Therapy–Fatigue, PD1/2 Pooled Data 1/2, PsA psoriatic arthritis