Table 2.

Multivariate logistic regression analysis to determine the factors associated with the classification of knee radiographs into the OA-like RA group.

Variables	Odds ratio	95% CI	p value
Age	1.00	0.98–1.03	0.53
Female (vs male)	0.58	0.23–1.43	0.23
BMI	1.10	1.02–1.18	0.006*
Use of bDMARDs	1.94	1.02–3.68	0.040*
CRP	0.80	0.67–0.96	0.020*

*The level of statistical significance was set at p < 0.05.

Abbreviations: BMI body mass index, bDMARDs biological disease modifying anti-rheumatic drugs, CRP C-reactive protein, CI confidence interval.