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. 2010 Nov 18;12(6):R213. doi: 10.1186/ar3190

Table 1.

Characteristics of rheumatoid arthritis study patientsa

Mean (SD) or number (%)
VARA
(n = 703)
SONORA
(n = 610)
Sociodemographics
 Age, yrb 64 (11) 53 (15)
 Male genderb 655 (93%) 173 (28%)
ACPA-positiveb 536 (76%) 420 (69%)
RA risk factors
HLA-DRB1 SE-positive 531 (76%) 434 (71%)
 One copy 356 (51%) 303 (50%)
 Two copies 175 (25%) 131 (21%)
GSTM1-null 372 (53%) 315 (52%)
Smoking historyb (n = 693) (n = 610)
 Never 140 (20%) 213 (35%)
 Former 371 (54%) 257 (42%)
 Current 182 (26%) 141 (23%)

aACPA, anticitrullinated protein antibody; GSTM1, glutathione S-transferase Mu-1; SE, shared epitope; SONORA, Study of New-Onset RA; VARA, Veterans Affairs Rheumatoid Arthritis Registry. bP < 0.05 for differences between VARA and SONORA.