Characteristic | Patients | Controls |
---|---|---|
Sex, M:F (%) | 88:7 (92.6:7.4) | 76:54 (58.5:41.5) |
Age (mean ± SD) | 33.4 ± 9.4 | 66.3 ± 5.8 |
Disease subgroup, n | Â | Â |
   Idiopathic AS | 83 |  |
   IBD | 3 |  |
   Reactive arthritis | 2 |  |
   Psoriatic arthritis | 1 |  |
   JAS | 6 |  |
Clinical features | Â | Â |
   Age on initial symptom, years (mean ± SD) | 23.1 ± 7.6 |  |
   Disease duration, months (mean ± SD) | 25.9 ± 8.5 |  |
   Delayed diagnosis, months (mean ± SD) | 32.1 ± 38.2 |  |
   HLA B27+ (n = 84) (%) | 74 (88.1) |  |
Complications, n (%) | Â | Â |
   Uveitis | 8 (8.4) |  |
   Peripheral joint involvement | 28 (29.4) |  |
   Total hip replacement | 13 (13.5) |  |
   IgA nephropathy | 0 (0) |  |
   Heart conduction abnormality | 0 (0) |  |
   Pneumonitis | 0 (0) |  |
   Cauda equina syndrome | 3 (3.1) |  |