Clinical characteristics of patients with rheumatoid arthritis (RA) or other non-inflammatory arthritides (non-RA) for Stanford Registry and EIRA cohorts
| Stanford Registry | EIRA | ||
|---|---|---|---|
| RA (n=30) | non-RA (n=48) | RA (n=2233) | |
| Age, mean (range) years | 46 (21–65) | 34 (19–64) | 51 (18–70 |
| Female, no. (%) | 26 (86.7) | 33 (86.8) | 1414 (71) |
| Disease duration, mean (range) years | 10.9 (2.6–38.6) | 8.5 (1.7–31.6) | 0* |
| RF-positive, no. (%) | 11 (40.7) | ND | 1320 (66.5) |
| CCP-positive, no. (%) | 14 (46.7) | ND | 1240 (63.1) |
| ESR, median(range) mm Hg | 20 (2–53) | ND | 26 (1–130) |
| CRP, median (range) mg/dL | 0.2 (0.2–4.4) | ND | 16 (0–276) |
| DAS28–ESR, median (range) | 4.42 (0.65–7.15) | ND | 5.32 (0.54–8.89) |
| DAS28–CRP, median (range) | 3.64 (1.1–6.2) | ND | ND |
*EIRA patients are newly diagnosed and disease duration is less than 1 year.
CCP, cyclic citrullinated peptide; CRP, C reactive protein; DAS, Disease Activity Score; EIRA, Epidemiological Investigation of RA; ESR, erythrocyte sedimentation rate; ND, not determined; RF, rheumatoid factor.