Association between Rheumatoid Arthritis and Respiratory Allergic Diseases in Korean Adults: A Propensity Score Matched Case-Control Study

Table 2

Matched conditional logistic regression of prevalence of RA.

		95% CI	value
Prevalence of respiratory allergic diseases
No respiratory allergic diseases	REF
Respiratory allergic diseases	1.52	(1.31–1.75)	<0.001
Sex
Male	REF
Female	1.42	(1.11–1.83)	0.006
Age (years)
<41	REF
41–59	1.17	(0.81–1.70)	0.410
59<	0.95	(0.67–1.35)	0.788
Household income (1,000 KRW)
<200	REF
200–450	0.51	(0.47–0.56)	<0.001
450<	1.23	(1.09–1.38)	<0.001
Cigarette smoking
Never/former	REF
Current	1.51	(1.24–1.85)	<0.001
Alcohol drinking
Never/former	REF
Current	1.44	(1.27–1.63)	<0.001
Occupation
None	REF
Blue collar	0.56	(0.49–0.63)	<0.001
White & pink collar	0.69	(0.59–0.80)	<0.001
Obesity
Normal	REF
Obese	1.30	(1.18–1.43)	<0.001
Body mass index (kg/m^2)
<18.5	REF
18.5–24.9	0.83	(0.63–1.10)	0.190
<24.9	0.65	(0.49–0.86)	0.002
Diabetes mellitus
Normal	REF
Impaired fasting glucose	0.53	(0.48–0.59)	<0.001
Diabetes mellitus	0.79	(0.70–0.88)	<0.001

Adjusted for sex, age, household income, cigarette smoking, alcohol drinking, occupation, obesity, BMI, and diabetes mellitus; , adjusted OR; CI, confidence interval.