Table 2.

Correlations between PsAID-12 pain, fatigue, skin problems, and total score and scores for other patient-reported outcomes

Outcome	Visit	Spearman rank correlation*†
		PsAID-12 pain	PsAID-12 fatigue	PsAID-12 skin problems	PsAID-12 total score
PsAQoL total score	Baseline	0.48	0.62	0.30	0.68
	Week 16	0.63	0.71	0.42	0.75
FACIT-fatigue	Baseline	0.46	0.71	0.27	0.66
	Week 16	0.58	0.77	0.42	0.74
PGA-PsA	Baseline	0.65	0.51	0.48	0.64
	Week 16	0.81	0.65	0.59	0.79
SF-36 physical functioning	Baseline	0.54	0.53	0.25	0.60
	Week 16	0.67	0.65	0.40	0.72
SF-36 role-physical	Baseline	0.53	0.55	0.23	0.61
	Week 16	0.65	0.68	0.41	0.74
SF-36 bodily pain	Baseline	0.69	0.58	0.24	0.66
	Week 16	0.81	0.69	0.46	0.80
SF-36 general health	Baseline	0.38	0.41	0.22	0.46
	Week 16	0.50	0.53	0.35	0.58
SF-36 vitality	Baseline	0.40	0.61	0.22	0.57
	Week 16	0.54	0.72	0.37	0.67
SF-36 PCS	Baseline	0.62	0.55	0.25	0.62
	Week 16	0.76	0.69	0.44	0.78

Convergent and divergent validity were assessed at baseline (n=1251) and week 16 (n=1204).

Strong correlations (≥0.5) are shown in bold.

*Absolute values are presented.

†p<0.001 for all correlations.

FACIT-Fatigue, Functional Assessment of Chronic Illness Therapy – Fatigue; PCS, physical component summary; PGA-PsA, Patient’s Global Assessment of Psoriatic Arthritis; PsAID-12, Psoriatic Arthritis Impact of Disease-12; PsAQoL, Psoriatic Arthritis Quality of Life; SF-36, 36-item Short Form Health Survey.