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) |