Table 2.

Criterion validity: cross‐sectional and longitudinal correlation between gout activity scores and functional disability or health‐related quality of life^a

	Baseline			6 months			12 months
	HAQ	SF‐36 PCS	SF‐36 MCS	HAQ	SF‐36 PCS	SF‐36 MCS	HAQ	SF‐36 PCS	SF‐36 MCS
Baseline GAS3‐step‐a	0.50	−0.57	−0.31				0.38	−0.24	−0.34
Baseline GAS1‐step‐a	0.50	−0.57	−0.31
6 months GAS3‐step‐a	0.35	−0.36	−0.31	0.43	−0.48	−0.33
6 months GAS1‐step‐a	0.34	−0.36	−0.31	0.41	−0.47	−0.31
12 months GAS3‐step‐a	0.38	−0.34	−0.24	0.40	−0.41	−0.25	0.55	−0.60	−0.32
12 months GAS1‐step‐a	0.38	−0.36	−0.24	0.39	−0.40	−0.26	0.53	−0.60	−0.33
Baseline GAS3‐step‐b	0.50	−0.57	−0.31
Baseline GAS1‐step‐b	0.50	−0.57	−0.30
6 months GAS3‐step‐b	0.35	−0.36	−0.31	0.42	−0.48	−0.33
6 months GAS1‐step‐b	0.35	−0.36	−0.30	0.41	−0.46	−0.32
12 months GAS3‐step‐b	0.38	−0.34	−0.24	0.41	−0.40	−0.25	0.54	−0.59	−0.33
12 months GAS1‐step‐b	0.39	−0.37	−0.23	0.39	−0.40	−0.27	0.53	−0.59	−0.33
Baseline GAS3‐step‐c	0.45	−0.51	−0.29
Baseline GAS1‐step‐c	0.44	−0.50	−0.28
6 months GAS3‐step‐c	0.30	−0.30	−0.27	0.38	−0.43	−0.32
6 months GAS1‐step‐c	0.29	−0.30	−0.27	0.37	−0.41	−0.31
12 months GAS3‐step‐c	0.34	−0.30	−0.21	0.36	−0.36	−0.20	0.50	−0.53	−0.30
12 months GAS1‐step‐c	0.34	−0.30	−0.20	0.35	−0.35	−0.23	0.49	−0.53	−0.30

^aAll Spearman's rho coefficient P values < 0.001. HAQ = Health Assessment Questionnaire; SF‐36 = Short Form 36 health survey; PCS = physical component summary; MCS = mental component summary; GAS = Gout Activity Score.