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

Table 5 Correlations between the DAS28 and the total RARBIS score among subgroups

Subgroup	Spearman	95% CI	p value*
Age			0.51
< 65 years (n = 65)	0.45	0.23 – 0.63
≥ 65 years (n = 35)	0.33	0.00 – 0.60
Gender			0.40
Male (n = 19)	0.52	0.09 – 0.79
Female (n = 81)	0.35	0.14 – 0.53
Rheumatoid factor			0.69
Negative (n = 27)	0.51	0.16 – 0.75
Positive (n = 67)	0.44	0.23 – 0.62
Duration of RA			0.96
< 5 years (n = 19)	0.35	-0.13 – 0.69
≥5 years (n = 81)	0.37	0.16 – 0.54

* p value for differences between subgroup correlations
CI, confidence interval; DAS28, 28-joint Disease Activity Score; RA, rheumatoid arthritis; RARBIS, rheumatoid arthritis medical records-based index of severity.

ISSN: 1478-6362