Demographic and descriptive characteristics of the study group
| Total (n=21) | AS1-150(n=3) | AS + PA1-150(n=7) | PsA1-150(n=9) | USpA1-150 (n=2) | |
| Age (years) | 49 (26–73) | 33 (26–65) | 44 (28–59) | 49 (30–73) | 48 (39–58) |
| Sex (M/F) | 17/4 | 3/0 | 6/1 | 6/3 | 2/0 |
| Disease duration (years) | 17 (1–42) | 15 (9–40) | 17 (10–33) | 19 (1–42) | 15 (3–28) |
| Swollen joint count (0–66) | 3 (0–12) | 0 | 2 (1–4) | 9 (1–12) | 9 (8–10) |
| Axial morning stiffness (min) | — | 90 (60–120) | 90 (30–240) | — | — |
| Axial night pain (0–3) | — | 3 (2–3) | 3 (1–3) | — | — |
| Erythrocyte sedimentation rate (mm/ 1st h) | 44 (10–101) | 26 (10–74) | 44 (10–101) | 27 (13–51) | 60 (29–92) |
| C reactive protein (g/l) | 0.046 (0.007–0.29) | 0.055 (0.029–0.064) | 0.092 (0.007–0.29) | 0.034 (0.007–0.061) | 0.061 (0.03–0.091) |
| HLA-B27 (+/−) | 14/5 | 3/0 | 6/1 | 4/3 | 1/1 |
Values are given as median (range).
↵1-150 AS = ankylosing spondylitis; AS + PA = ankylosing spondylitis with peripheral arthritis; PsA = psoriatic arthritis; USpA = undifferentiated spondyloarthropathy.