Table 6

Spearman's correlation coefficient of composite scores with joint counts in patients with DIP involvement (according to classification of psoriatic arthritis (PsA) by Wright and Moll3) of IMPACT 2 and the observational data set

	TJC28		SJC28		TJC68		SJC66
	IMPACT 2	Observational	IMPACT 2	Observational	IMPACT 2	Observational	IMPACT 2	Observational
DAREA	0.80^***	0.57^**	0.66^***	0.41^*	0.84^***	0.72^***	0.71^***	0.45^*
DAS28	0.77^***	0.38^*	0.55^***	0.24; NS	0.71^***	0.51^**	0.52^**	0.27; NS
SDAI	0.74^***	0.55^*	0.71^***	0.37; NS	0.68^***	0.68^***	0.66^***	0.40; NS
CDAI	0.83^***	0.79^***	0.77^***	0.41^**	0.80^***	0.80^***	0.73^***	0.43^**

Given are correlation coefficients (Spearman's r).
↵* p<0.05,
↵** p<0.01,
↵*** p<0.001.
IMPACT 2: N=40, observational data set: N=41.
CDAI, clinical disease activity index; DAREA, ‘Disease Activity index for REactive Arthritis’; DAS28, disease activity score using 28 joint counts; DIP, distal interphalangeal joint; IMPACT 2, Infliximab Multinational Psoriatic Arthritis Controlled Trial 2; SDAI, simplified disease activity index; SJC, swollen joint count; TJC, tender joint count.