Table 2

Multivariate linear regression analysis of factors associated with ASDAS-CRP and BASDAI

	ASDAS-CRP			BASDAI
	Standard coefficient	Regression coefficient (95% CI)	p Value	Standard coefficient	Regression coefficient (95% CI)	p Value
HLA-B27 positivity	−0.11	−0.23 (−0.40 to −0.05)	0.01	−0.13	−0.53 (−0.86 to −0.21)	<0.001
Caucasian race	−0.16	−0.56 (−0.83 to −0.28)	<0.001	−0.17	−0.91 (−1.45 to −0.38)	0.001
Male gender	NS	NS	NS	−0.09	−0.34 (−0.68 to −0.00)	0.048
CRP	NI	NI	NI	0.11	0.18 (0.03 to 0.33)	0.02
ESR	NI	NI	NI	0.13	0.31 (0.10 to 0.52)	0.01
MRI spinal inflammation	0.10	0.24 (0.04 to 0.44)	0.02	NS	NS	NS
MRI SIJ inflammation	NS	NS	NS	−0.16	−0.66 (−1.00 to −0.32)	<0.001

ASDAS, Ankylosing Spondylitis Disease Activity Score (CRP-based); BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; CRP, C reactive protein; ESR, erythrocyte sedimentation rate; HLA-B27, human leucocyte antigen B27; NI, not included in multivariate analysis; NS, not significant in multivariate analysis; SIJ, sacroiliac joints.