Patient characteristics
| BASDAI, Bath ankylosing spondylitis disease activity index; IBD, inflammatory bowel disease. | |
| Number of patients | 20 |
| Male/female | 14/6 |
| Mean age (years (range)) | 39 (27 to 54) |
| Mean disease duration (years (range)) | 16 (3 to 31) |
| BASDAI (mean (range)) | 5.8 (4.3 to 7.6) |
| HLA-B27 positive (n) | 20 |
| Peripheral joint involvement (n) | 5 |
| History of uveitis (n) | 5 |
| Enthesitis (n) | 5 |
| Psoriasis (n) | 1 |
| IBD (n) | 2 |
| C reactive protein >10 mg/l (n) | 16 |