Development of a health care utilisation data-based index for rheumatoid arthritis severity: a preliminary study

Table 3 Unadjusted Spearman correlations with the rheumatoid arthritis records-based index of severity (RARBIS) with and without medication sub-scale

	RARBIS with medication sub-scale		RARBIS without medication sub-scale
Claims-based variables	Correlation coefficient	p value	Correlation coefficient	p value
Rheumatology visits	0.32472	< 0.001	0.1859	0.04
Rehabilitation visits	0.11249	0.22	0.19199	0.04
X-ray	0.07798	0.40	0.01623	0.86
Rheumatoid lung involvement	-0.02654	0.77	-0.0428	0.64
Felty's syndrome	0.16301	0.08	0.18168	0.047
Hand surgery	0.07074	0.44	0.05358	0.56
Number of inflammatory marker tests ordered	0.38775	<.0001	0.28664	0.002
Rheumatoid factor test	0.22267	0.01	0.22	0.02
Number of platelet counts ordered	0.29883	<0.0001	0.21888	0.02
Number of chemistry panels ordered	0.26246	0.004	0.15374	0.0936
Medication count	---	---	0.21497	0.0184

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