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.