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Table 1 Characteristics of the RA-discordant twin pairs

From: Increased DNA methylation variability in rheumatoid arthritis-discordant monozygotic twins

Characteristic RA (n = 79) Non-RA (n = 79) p value
*Age (years), mean (SD) 54.2 (12.2) 54.2 (12.2)  
Female, n (%) 67 (86) 67 (86)  
*Disease duration (years), median (IQR) 9.8 (5.1, 17.2)  
Anti-CCP and/or RF positive, n (%) 46 (59%) 7 (9%)  
*DMARDs, n (%) 41 (52%)  
Smoking status    0.53
 Current, n (%) 15(19) 12 (16)  
 Past, n (%) 26 (33) 22(28)  
 Never, n (%) 37(49) 44 (56)  
**Cell type
 CD8T 0.05 0.05 0.73
 CD4T 0.24 0.19 0.16
 Natural killer 0.06 0.06 0.99
 B cell 0.06 0.05 0.61
 Monocyte 0.08 0.07 0.15
 Granulocyte 0.51 0.57 0.25
  1. *At sampling
  2. **Estimated from the DNA methylation data