Table 1. Demographic data and comorbidity comparison of the study subjects.

Variables	Non-RA cohort	RA cohort	P
	N = 15456(%)	N = 8331(%)
Age, (years)			0.62
< = 40	2587(16.7)	1359(16.3)
41–60	7441(48.1)	4004(48.1)
60+	5428(35.1)	2968(35.6)
Mean (Standard Deviation, SD)	54.38(14.0)	54.60(14.0)	0.24
Gender			0.12
Female	10334(66.9)	5652(67.8)
Male	5122(33.1)	2679(32.2)
Monthly income			0.45
Low	6673(43.2)	3592(43.1)
Median	7942(51.4)	4253(51.1)
High	841(5.4)	486(5.8)
Level of urbanization			<0.001
Urban	8369(54.1)	4435(53.2)
Suburban	2652(17.2)	1241(14.9)
Rural	4435(28.7)	2655(31.9)
Comorbidity
Hypertension	3014(19.5)	2426(29.1)	<0.001
Stroke	606(3.9)	425(5.1)	<0.001
Diabetes	1412(9.1)	1162(13.9)	<0.001
Heart disease	1437(9.3)	1335(16.0)	<0.001
Chronic kidney disease	181(1.2)	160(1.9)	<0.001
Cancer	473(3.1)	269(3.2)	0.48
Alcohol dependence syndrome	7(0.0)	15(0.2)	0.001
Tobacco use	22(0.1)	14(0.2)	0.63