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