Table 2.

Multivariable stepwise backward conditional logistic regression model for plaque

Characteristic	OR (95% CI)	P
Age	1.15 (1.07-1.24)	<0.0001
Number of synthetic DMARDs used	1.51 (1.05-2.17)	0.03
Total cholesterol	1.66 (1.00-2.74)	0.04
Statin use	3.55 (0.93-13.52)	0.06
Prednisone use ever	3.77 (0.72-19.69)	0.1
Classification:
Sensitivity, %	51.4
Specificity, %	91.7
Positive predictive value, %	66.7
Negative predictive value, %	85.5
Correct prediction, %	81.9

The variables systolic blood pressure and antihypertensive agent use were deleted by backward elimination.

OR, odds ratio; CI, confidence interval; DMARDs, disease-modifying antirheumatic drugs.