Table 1.
Clinical characteristics of RA patients and controls.
| Variables | Healthy control (n = 73) | Rheumatoid arthritis (n = 62) | |||
|---|---|---|---|---|---|
| All (n = 62) | DAS28-ESR ≤ 3.2 (n = 13) | 3.2 < DAS28-ESR ≤ 5.1 (n = 25) | DAS28-ESR > 5.1 (n = 24) | ||
| Female, n (%) | 48 (65.8) | 43 (69.4) | 8 (61.5) | 20 (80.0) | 15 (62.5) |
| Age (years) | 49.6 ± 10.6 | 53.3 ± 10.0 | 46.3 ± 10.2 | 54.2 ± 7.7 | 56.3 ± 10.4 |
| Duration (m) | – | 3.0 (2.0–12.0) | 4.0 (3.0–10.0) | 3.0 (2.0–12.0) | 3.0 (2.0–10.5) |
| RF (KU/L) | – | 72.2 (18.5–175.1) | 52.2 (9.0–212.9) | 72.4 (25.4–158.4) | 72.7 (14.1–214.9) |
| Anti-CCP (U/ml)* | – | 89.6 (12.2–200.0) | 200.0 (0.5–200.0) | 70.4 (18.2–200.0) | 84.5 (5.4–200.0) |
| ESR (mm/h) | – | 37.5 (21.5–54.0) | 17.0 (4.5–28.0) | 36.0 (19.5–46.5) | 53.5 (33.5–68.8) |
| DAS28-ESR | – | 4.50 (3.33–5.58) | 2.59 (2.29–2.90) | 4.25 (3.76–4.67) | 5.94 (5.51–6.38) |
| Stiffness, n (%) | – | 27 (43.5) | 1 (7.7) | 11 (44.0) | 15 (62.5) |
*Six RA patients lack anti-CCP antibody data. TJC28, Tender Joint Count 28 Joints; SJC, Swollen Joint Count 28 Joints; RF, rheumatoid factor; anti-CCP, anti-cyclic citrullinated peptide; ESR, erythrocyte sedimentation rate. DAS28-ESR, Disease Activity Score in 28 Joints System with Erythrocyte Sedimentation Rate, formula: DAS28-ESR = [0.56 * sqrt(TJC28) + 0.28 * sqrt(SJC28) + 0.70 * Ln(ESR)] * 1.08 + 0.16.