Table 1.
Baseline characteristics of patients that presented with early arthritis
| Patients (n = 441) | |
|---|---|
| Age, mean (SD) | 57 (16) |
| Female, n (%) | 267 (61) |
| Symptom duration, in weeks, median (IQR) | 9 (4–27) |
| 66-Swollen joint count, median (IQR) | 3 (1–7) |
| CRP (mg/L), median (IQR) | 7 (3–20) |
| ACPA positive, n (%) | 156 (37) |
| Diagnosis, n (%) | |
| Rheumatoid arthritis (RA) | 157 (36) |
| Unclassified arthritis | 148 (33) |
| Psoriatic arthritis or pondyloarthritis | 45 (10) |
| Inflammatory osteoarthritis | 23 (5) |
| Reactive arthritis | 7 (2) |
| RS3PE | 12 (3) |
| SLE and MCTD | 5 (1) |
| Other diagnoses | 44 (10) |
SD standard deviation, IQR interquartile range, CRP C-reactive protein, ACPA anti-citrullinated peptide antigen, RA rheumatoid arthritis according to clinical diagnosis and 2010 criteria during the first year of follow-up, RS3PE remitting seronegative symmetrical synovitis with pitting edema, SLE systemic lupus erythematosus, MCTD mixed connective tissue disease. The 66-swollen joint count was assessed