| Characteristic | SLE (n=41) | RA (n=522) |
|---|---|---|
| Age, median (interquartile range), years | 39.0 (18–77) | 60.0 (51–68) |
| Female sex | 33 (80.5) | 352 (67.4) |
| White | 35 (85.4) | NC |
| Previous or current tobacco smoking | 18 (43.9) | 183 (65.6)* |
| Fulfilled 1982 ACR SLE classification criteria | 36 (87.8) | NA |
| Number of fulfilled ACR SLE criteria, mean (range) | 4.7 (3–9) | NA |
| Fulfilled 2012 SLICC classification criteria | 41 (100) | NA |
| Fulfilled 1987 ACR RA criteria | NA | 439 (84.1) |
Data are n (%) unless otherwise specified.
*n=279.
ACR=American College of Rheumatology; NA=not available; NC=not collected due to ethics approval; RA=rheumatoid arthritis; SLE=systemic lupus erythematosus; SLICC=Systemic Lupus International Collaborating Clinics.