Table 2.
Characteristics of seronegative and seropositive patients with rheumatoid arthritis (RA) at RA incidence date.
| Characteristics | Seronegative (N=209) | Seropositive (N=388) |
|---|---|---|
| Age, years, mean (SD) | 56.6 (16.0) | 54.9 (14.9) |
| Sex, female | 149 (71%) | 270 (70%) |
| Race | ||
| Black or African American | 4 (2%) | 12 (3%) |
| White | 200 (96%) | 338 (87%) |
| Other | 5 (2%) | 38 (10%) |
| Body mass index, kg/m2, mean (SD) | 28.9 (6.5) | 29.4 (6.8) |
| Obesity (BMI ≥30 kg/m2) | 74 (35%) | 167 (43%) |
| Smoking Status | ||
| Never | 120 (57%) | 193 (50%) |
| Former | 65 (31%) | 126 (32%) |
| Current | 24 (12%) | 69 (18%) |
| Number of non-rheumatic comorbidities at RA incidence | ||
| 0 | 70 (33%) | 155 (40%) |
| 1 | 48 (23%) | 96 (25%) |
| 2 | 40 (19%) | 68 (18%) |
| 3 | 26 (12%) | 39 (10%) |
| 4 | 8 (4%) | 18 (5%) |
| 5+ | 17 (8%) | 12 (3%) |