Table 2.

Crude and adjusted hazard ratios (95% confidence interval) of rheumatoid arthritis for asthma.

Characteristics	Asthma
	Crude†	P-value	Adjusted†,‡	P-value
Rheumatoid arthritis	1.31 (1.22–1.40)	<0.001*	1.23 (1.15–1.32)	<0.001*
Control	1.00		1.00

^*Cox-proportional hazard regression model, Significance at P < 0.05.

^†Stratified model for age, income, and region of residence, hypertension, diabetes mellitus, and dyslipidemia histories.

^‡Adjusted model for depression histories, and Charlson Comorbidity Index.