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

Table 4 Spearman's rank correlation of the total RARBIS score with the DAS28

Score	Spearman	95% CI	p value*
Total RARBIS score	0.41	0.23 – 0.56	<0.0001
Subscales:
Clinical subscale	0.42	0.24 – 0.57	<0.0001
Surgery subscale	0.09	-0.11 – 0.28	0.3690
X-ray subscale	0.34	0.15 – 0.50	0.0005
Extra-articluar subscale	0.002	-0.19 – 0.20	0.9875
Laboratory subscale	0.12	-0.09 – 0.30	0.2890
Medication subscale	-0.01	-0.21 – 0.18	0.8860
Total score with medication	0.33	0.14 – 0.49	0.0007

* p value for correlations
The total RARBIS score excludes the medication subscale and was calculated by summing the clinical, surgery, X-ray, extra-articular manifestation, and laboratory subscales. CI, confidence interval; DAS28, 28-joint Disease Activity Score; RARBIS, rheumatoid arthritis medical records-based index of severity.

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