Patients characteristics
| AS (30) | Control AS (30) | OCI (29) | Control OCI (29) | DISH (31) | |
| Age (years) | 63.4±1.5 | 60.3±3.4 | 37.9±1.5 | 37.6±1.4 | 76.9±1.7 |
| Male (%) | 50 % | 50 % | 0 % | 0 % | 52 % |
| Disease duration (years) | 19.88±13 | – | – | – | – |
| HLA B27 (%) | 77 % | – | – | – | – |
| Sacroiliac ankylosis | 23 % | 0 % | 0 % | 0 % | 0 % |
| Physical work | 56 % | ||||
| smoker | 57 % |
AS, ankylosing spondylitis; DISH, diffuse idiopathic skeletal hyperostosis; OCI, osteitis condensans ilii.