Table 4.

Multivariable logistic regression analyses with presence of ≥1 syndesmophyte or severe radiographic alterations^a as dependent variables

	≥1 syndesmophyte			Severe radiographic changes
Covariates	OR	95% CI	P-value	OR	95% CI	P-value
Age, years	1.10	1.06, 1.15	<0.001	1.09	1.05, 1.15	<0.001
Sex	0.16	0.06, 0.38	<0.001	0.18	0.05, 0.57	0.002
BMI, kg/m2	0.98	0.92, 1.06	0.672	1.03	0.95, 1.12	0.495
Ever smoker	1.03	0.47, 2.27	0.932	0.82	0.33, 2.01	0.668
Log hsCRP, mg/l	1.64	0.87, 1.80	0.236	1.19	0.88, 2.00	0.182
Log IgA anti-CD74, U/ml	5.64	1.02, 35.58	0.048	8.11	1.13, 67.31	0.037

^aDefined as ≥3 consecutive inter-vertebral bridges in the cervical spine and/or the lumbar spine. Female sex was coded 1 and male sex 0. hsCRP: high sensitivity CRP.