The validity of a rheumatoid arthritis medical records-based index of severity compared with the DAS28

Table 6 Correlations between the DAS28 and the revised RARBIS

Weights	Spearman	95% CI	p value*
Original	0.41	0.23–0.56	<0.0001
Weight (1)	0.43	0.26–0.58	<0.0001
(2)	0.48	0.31–0.62	<0.0001
(3)	0.44	0.27–0.59	<0.0001

Three different weighting systems were pursued: (1) exchanging the maximum scores of the clinical status subscale and the surgery subscale; (2) up-weighting the clinical status subscale by a factor of two, and removing the surgery subscale and the extra-articular manifestation subscale; (3) multiplying each subscale by the regression coefficients of a linear regression of all subscales on the DAS28. CI, confidence interval; DAS28, 28-joint Disease Activity Score; RARBIS, rheumatoid arthritis medical records-based index of severity.

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