Characteristics of the study population
| Variable | Anti-CCP positive patients (n = 10) | Anti-CCP negative patients (n = 124) | p Value |
|---|---|---|---|
| Values are mean (SD) nor n (%). | |||
| *Value with Yates’ correction. | |||
| AKA, anti-keratin antibodies; anti-CCP, anti-cyclic citrullinated peptide antibodies; ESR, erythrocyte sedimentation rate; IgG, immunoglobulin G; SSA/B, Sjögren’s syndrome antibodies, type A/type B | |||
| Age (years) | 49.5 (11.5) | 56.8 (13.7) | 0.11 |
| Disease duration (years) | 10.1 (5.7) | 11.0 (6.7) | 0.65 |
| Synovitis | 2 (20%) | 34 (27.4%) | 0.9* |
| Extraglandular involvement | 2 (20%) | 49 (39.5%) | 0.5* |
| ESR (mm/h) | 31.1 (22.1) | 32.1 (27.7) | 0.91 |
| Serum IgG (g/l) | 17.1 (9.5) | 16.6 (8.2) | 0.87 |
| AKA | 5 (50%) | 2 (1.6%) | <0.001* |
| Rheumatoid factor | 7 (70%) | 73 (58.9%) | 0.9* |
| Anti-SSA | 6 (60%) | 73 (58.9%) | >0.9* |
| Anti-SSB | 3 (30%) | 47 (37.9%) | >0.9* |
| Focus score ⩾1 | 8 (80%) | 97 (78.2%) | >0.9* |