Table 4

Correlational validity; Pearson correlations at baseline and of all visits

Baseline/ All visits (grey background)
DAPSA DAPSA28 DAS28CRP SDAI CDAI
DAPSA 10.93*
(n=1033)		0.87*
(n=1033)		0.92*
(n=947)		0.92*
(n=947)
DAPSA28 0.94*
(n=6421)		10.93*
(n=2399)		0.99*
(n=2148)		0.99*
(n=2148)
DAS28CRP 0.89*
(n=6421)		0.94*
(n=20 406)		10.94*
(n=2189)		0.92*
(n=2189)
SDAI 0.94*
(n=5888)		0.99*
(n=18 565)		0.94*
(n=18 819)		10.99*
(n=2189)
CDAI 0.94*
(n=5888)		0.99*
(n=18 565)		0.92*
(n=18 819)		0.99*
(n=18 819)		1

  • *P<0.001 (p found by GEE when multiple registrations per patient).

  • CDAI, clinical disease activity index;CRP, C reactive protein;DAS28CRP, 28-joint disease activity score with CRP;GEE, generalised estimating equation;SDAI, simplified disease activity index.