Table 3.

Multivariable linear regression analysis in 155 patients with radiographic axial spondyloarthritis (r-axSpA) with logarithmic plasma level of IgA anti-CD74 concentrations as dependent variable and r-axSpA related and demographics as covariates

	Logarithmic plasma level of IgA anti-CD74, U/ml
Covariate	Β	95% CI	Β, standardized	P-value
Age, years	−0.005	−0.008, −0.001	−0.24	0.006
Sex	−0.039	−0.121, 0.043	−0.07	0.35
BMI, kg/m2	0.005	−0.002, 00.012	0.11	0.13
Ever smoker	0.080	0.009, 0.152	0.17	0.028
NSAID, regular use	−0.081	−0.154, −0.009	−0.16	0.028
csDMARD and/or bDMARD	0.056	−0.028, 0.14	0.10	0.19
Prednisolone	0.192	0.064, 0.320	0.22	0.004
ESR, mm/h	0.005	0.002, 0.008	0.23	0.003
mSASSS, score	0.002	0.002, −0.004	0.17	0.041
R2 0.26

bDMARD: biologic DMARD; csDMARD: conventional synthetic DMARD; mSASSS: Modified Sroke Ankylosing Spondylitis Score.