Determinants of adherence to disease modifying anti-rheumatic drugs in White British and South Asian patients with rheumatoid arthritis: a cross sectional study

Table 7 Multivariable analysis of medication adherence (Data for all participants)

	B	Confidence interval	P value	R ^{2 for model}
				0.328
Age (years)	−0.012	−0.049–(0.025)	0.523
Gender (male)	−0.754	−1.754–(0.245)	0.138
Number of years education	−0.022	−0.095–(0.050)	0.540
English spoken by patient	−0.492	−2.384–(1.399)	0.608
Same language spoken by patient and GP	1.447	−0.466–(3.360)	0.137
Born in Pakistan^a	2.071	−0.023–(4.165)	0.053
Born in India^a	1.575	−0.158–(3.307)	0.075
Ethnicity (White British)	7.333	2.924–(11.743)	0.001*
BMQ
NCD	0.079	−0.590–(0.749)	0.815
General Overuse	−0.193	−0.478–(0.092)	0.183
General Harm	−0.049	−0.250–(0.153)	0.635
SIMS
SIMS action and usage (South Asian patients)	0.560	0.163–(0.958)	0.006*
SIMS action and usage (White British patients)	−0.202	−0.595–(0.191)	0.311
SIMS potential problems	0.428	0.217–(0.639)	<0.001**
IPQ
IPQ Personal control	−0.070	−0.205–(0.066)	0.310
IPQ Illness coherence	0.086	−0.038–(0.211)	0.174
Interaction
SIMS action and usage x ethnicity^b			0.005*

^a= reference category born in UK. ^bThe significant interaction indicates that the effect of SIMS action and usage varies with ethnic group: hence two separate sets of values for South Asian and White British patients. * = significant at <0.01 ** = significant at <0.001

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