Univariate logistic regression
| Sacroiliitis | No Sacroiliitis | OR (CI 95%) | p-value | |
|---|---|---|---|---|
| n=127 (n%) | n=232 (n%) | |||
| Sex (men) | 94 (74.0) | 120 (51.7) | 2.6 (1.6–4.2) | <0.001 |
| Psoriasis duration, mean (SD) | 12.6 (9.2) | 10.8 (0.2) | 1.0 (0.9–1.0) | 0.082 |
| PsA duration, mean (SD) | 5.5 (5.9) | 4.5 (6.3) | 1.0 (1.0–1.0) | 0.041 |
| Onset age of PsA ≤45 years | 76 (59.8) | 131 (56.6) | 1.1 (0.7–1.7) | 0.536 |
| – None | 70 (56.5) | 150 (65.8) | Reference | |
| – Paternal | 29 (23.4) | 35 (15.4) | 1.7 (1.0–3.1) | 0.048 |
| – Maternal | 25 (20.2) | 43 (18.9) | 1.2 (0.7–2.2) | par 0.449 |
| IBP | 93 (73.2) | 22 (9.5) | 26.1 (14.9–47.0) | <0.001 |
| HLA-B27 + | 22 (17.5) | 11 (4.8) | 4.1 (1.9–9.0) | <0.001 |
| – <10% | 177 (76.6) | 78 (61.9) | Reference | |
| – 10–25% | 21 (16.7) | 21 (16.7) | 1.5 (0.8–2.8) | 0.170 |
| – >25% | 23 (10.0) | 27 (21.4) | 2.6 (1.4–4.9) | 0.002 |