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

From: Bidirectional associations between rheumatoid arthritis and depression: a nationwide longitudinal study

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