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Table 3 Correlations to assess the convergent validity of FACIT-Fatigue vs. other measures 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From: RETRACTED ARTICLE: Content validity and psychometric evaluation of Functional Assessment of Chronic Illness Therapy-Fatigue in patients with psoriatic arthritis

FACIT-Fatigue vs.: PD1: OPAL Beyond baseline data pooled with OPAL Broaden Month 12 data, Pearson correlation coefficient PD2: OPAL Broaden baseline data pooled with OPAL Beyond Month 6 data, Pearson correlation coefficient
Experience domain Impact domain Total score Experience domain Impact domain Total score
SF-36
 Bodily pain 0.71 0.69 0.72 0.66 0.64 0.68
 General health 0.57 0.55 0.58 0.59 0.55 0.59
 Mental health 0.65 0.64 0.66 0.65 0.65 0.67
 Physical functioning 0.64 0.69 0.69 0.56 0.62 0.62
 Role emotional 0.63 0.70 0.70 0.56 0.64 0.63
 Role physical 0.71 0.75 0.76 0.63 0.71 0.70
 Social functioning 0.71 0.78 0.78 0.66 0.73 0.72
 Vitality 0.83 0.75 0.81 0.81 0.75 0.81
 Health transition −0.33 −0.29 −0.32 −0.35 −0.33 −0.35
 Mental component 0.68 0.70 0.71 0.66 0.69 0.70
 Physical component 0.64 0.65 0.67 0.58 0.60 0.61
ISI −0.42 −0.37 −0.41 − 0.43 −0.41 − 0.44
DLQI total score −0.43 − 0.43 −0.44 − 0.43 −0.48 − 0.48
PtGA −0.64 − 0.60 −0.64 − 0.61 −0.57 − 0.61
PtJA −0.65 − 0.62 −0.65 − 0.61 −0.57 − 0.61
PtSA −0.47 − 0.45 −0.47 − 0.44 −0.44 − 0.46
  1. All results P < 0.0001. Correlation coefficients are all in the expected direction
  2. DLQI Dermatology Life Quality Index, FACIT-Fatigue Functional Assessment of Chronic Illness Therapy–Fatigue, ISI Itch Severity Item, PD1/2 Pooled Data 1/2, PtGA Patient’s Global Assessment of Psoriasis and Arthritis (a component of the PtGJS-VAS), PtGJS Patient’s Global Joint and Skin Assessment, PtJA Patient’s Joint Assessment (a component of the PtGJS-VAS), PtSA Patient’s Skin Assessment (a component of the PtGJS-VAS), PsA: psoriatic arthritis, SF-36 Short Form Survey-36, VAS Visual Analog Scale