Table 2.

Multivariable analysis.

Variable	OR	95% CI	p
Age
20–39	Ref
40–59	4.099	1.156–14.533	0.029
≥ 60	6.436	1.775–23.345	0.005
Sex
Male	Ref
Female	1.020	0.515–2.018	0.955
Educational level
Basic level	Ref
Medium level	0.782	0.348–1.756	0.551
High level	0.566	0.241–1.333	0.193
Smoking habit
Never	Ref
Former smoker	1.266	0.583–2.752	0.551
Current smoker	1.588	0.694–3.635	0.274

Variables associated with the presence of rheumatoid arthritis.

OR odds ratio, CI confidence interval.