Table 1.
Baseline patient characteristicsa
| Age at enrollment, mean ± SD years | 31.0 ± 8.2 |
| Male sex | 72 (38.3) |
| Symptom duration at first visit, mean ± SD months | 13.2 ± 7.1 |
| Good response to NSAIDs | 76 (41.3) |
| IBP | 139 (74.3) |
| Family history of SpA | 96 (51.3) |
| Peripheral arthritis | 34 (18.2) |
| Dactylitis | 15 (8.0) |
| Enthesitis | 41 (21.9) |
| Uveitis | 16 (8.6) |
| IBD | 17 (9.1) |
| Psoriasis | 25 (13.4) |
| Elevated CRP level | 35 (18.9) |
| HLA–B27 positive | 91 (48.4) |
| Radiographically detected sacroiliitis | 19 (11.1) |
| MRI‐detected positive result for axial SpAb | 31 (16.5) |
| Axial SpA diagnosisc | 74 (39.6) |
a
Except where indicated otherwise, values are the number (%) of patients. NSAIDs = nonsteroidal antiinflammatory drugs; IBP = inflammatory back pain; SpA = spondyloarthritis; IBD = inflammatory bowel disease; CRP = C‐reactive protein; MRI = magnetic resonance imaging.
b
Based on Assessment of SpondyloArthritis international Society axial SpA criteria.
c
According to rheumatologist, with a confidence level of ≥7 (rating scale 0–10).