Characteristics of the study population.
| Characteristics | SpA | PsA | USpA | ReA | EA | AS |
|---|---|---|---|---|---|---|
| Patients, n | 357 | 108 | 85 | 68 | 72 | 24 |
| Age, yrs, mean ± SD | 37.86 ± 11.03 | 39.86 ± 10.89 | 35.56 ± 10.79 | 31.85 ± 11.69 | 34.65 ± 9.37 | 36.23 ± 10.42 |
| Women/men | 172/185 | 57/51 | 41/44 | 33/35 | 38/34 | 3/21 |
| Rheumatoid factor, n (%) | 41 (11.48) | 14 (12.96) | 11 (12.94) | 12 (17.65) | 3 (4.17) | 1 (4.17) |
| Anti-CCP, no. patients (%) | 12/127 (9.45) | 4/37 (10.81) | 3/29 (10.34) | 3/28 (10.71) | 1/25 (4.00) | 1/8 (12.50) |
| Articular involvement, n (%) | ||||||
| Axial | 145 (40.62) | 35 (32.41) | 41 (48.23) | 24 (35.29) | 25 (34.72) | 20 (83.33) |
| Peripheral | 212 (59.38) | 73 (67.59) | 44 (51.77) | 44 (64.71) | 47 (65.28) | 4 (16.67) |
| Oligoarticular | 99 (27.73) | 31 (28.70) | 15 (17.65) | 25 (36.76) | 25 (34.72) | 3 (12.50) |
| Polyarticular | 113 (31.65) | 42 (38.89) | 29 (34.12) | 19 (27.94) | 22 (30.56) | 1 (4.17) |
| Disease duration, yrs (%) | ||||||
| Early, ≤ 2 | 146 (40.90) | 42 (38.89) | 37 (43.53) | 29 (42.65) | 33 (45.83) | 5 (20.83) |
| Late, > 2 | 211 (59.10) | 66 (61.11) | 48 (56.47) | 39 (57.35) | 39 (54.17) | 19 (79.17) |
| Disease activity (DAS28), n (%) | ||||||
| < 2.6 | 21 (9.91) | 7 (9.59) | 5 (11.36) | 4 (9.09) | 5 (10.64) | 0 (0.00) |
| 2.6–3.2 | 89 (41.98) | 27 (36.99) | 17 (38.64) | 22 (50.00) | 21 (44.68) | 2 (50.00) |
| 3.2–5.1 | 77 (36.32) | 30 (41.09) | 17 (38.64) | 14 (31.82) | 15 (31.91) | 1 (25.00) |
| > 5.1 | 25 (11.79) | 9 (12.33) | 5 (11.36) | 4 (9.09) | 6 (12.77) | 1 (25.00) |
| BASDAI, n (%) | ||||||
| < 4.0 | 79 (54.48) | 21 (60.00) | 20 (48.78) | 15 (62.50) | 16 (64.00) | 7 (35.00) |
| > 4.0 | 66 (45.52) | 14 (40.00) | 21 (51.22) | 9 (37.50) | 9 (36.00) | 13 (65.00) |
DAS28: 28-joint count Disease Activity Score; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; anti-CCP: anticyclic citrullinated peptide antibodies. SpA: spondyloarthropathy; PsA: psoriatic arthritis; USpA: undifferentiated SpA; ReA: reactive arthritis; EA: enteropathic spondyloarthritides; AS: ankylosing spondylitis.