Table 2.

Univariate and multivariate logistic regression analyses for prevalence of chronic obstructive pulmonary disease (COPD) in patients with rheumatoid arthritis (RA).

	Unadjusted OR	Adjusted* OR
Unmatched population (before near-neighbor propensity matching)	1.73 (95% CI 1.70–1.76), p < 0.0001	1.28 (95% CI 1.26–1.31), p < 0.0001
Matched population (after near-neighbor propensity matching)	1.23 (95% CI 1.20–1.25), p < 0.0001	1.20 (95% CI 1.17–1.22), p < 0.0001

* Adjusted for age, gender, race and smoking status.

CI: confidence interval; OR: odds ratio.