Table 1.
Patient demographics and risk factors in rheumatoid arthritis, all subjects.
| Variable | Cases (n = 329) | Controls (n = 697) | p |
|---|---|---|---|
| Age (years) | 53.64 (±15.52) | 53.45 (±11.35) | 0.829 |
| Female/male | 247/82 | 496/201 | 0.190 |
| Age at onset, years, mean ± SD | 44.93 (±12.55) | – | – |
| Disease duration, years, mean ± SD | 8.76 (±9.31) | – | – |
| Treatment duration, years, mean ± SD | 7.07 (±7.38) | – | – |
| RF-positive, no. (%) | 266 (80.9%) | – | – |
| ACPA-positive, no. (%) | 163 (49.5%) | – | – |
| CRP-positive, no. (%) | 165 (50.2%) | – | – |
| ESR, mm/h | 34.00 (±23.96) | – | – |
| DAS28 | 4.33 (±1.61) | – | – |
| Functional class, no. (%) | – | – | |
| I | 49 (14.9%) | – | – |
| II | 136 (41.3%) | – | – |
| III | 116 (35.3%) | – | – |
| IV | 28 (8.5%) | – | – |
RF: Rheumatoid factor; ACPA: Anti-cyclic citrullinated peptide; CRP: C-reactive protein; ESR: Erythrocyte sedimentation rate; DAS28: RA disease activity score.