Table 1.
Patient demographics and risk factors in rheumatoid arthritis.
| Variable | Cases (n = 574) | Controls (n = 804) | P |
|---|---|---|---|
| Age (years) | 54.5 (± 15.1) | 55.7 (±10.1) | 0.080 |
| Female/male | 427/147 | 599/205 | 0.962 |
| Age at onset, years, mean ± SD |
45.6 (±12.9) | — | — |
| Disease duration, years, mean SD |
8.9 (±9.2) | — | — |
| Treatment duration, years, mean ± SD |
7.6 (±7.8) | — | — |
| RF-positive, no. (%) | 456 (79.4%) | — | — |
| ACPA positive, no. (%) | 300 (52.2%) | — | — |
| CRP-positive, no. (%) | 323 (56.3%) | — | — |
| ESR, mm/h | 33.7 (±25.2) | — | — |
| DAS28 | 4.3 (±1.5) | — | — |
| Functional class, no. (%) | |||
| I | 73 (12.7%) | — | — |
| II | 256 (44.6%) | — | — |
| III | 209 (36.4%) | — | — |
| IV | 36 (6.3%) | — | — |
RF, rheumatoid factor; ACPA, anti-cyclic citrullinated peptide antibodies; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; DAS28, RA disease activity score.