Selected demographic and clinical data of the 65 patients with ankylosing spondylitis
| Age, mean years (SD) | 33 (11) |
| Gender, n (%) | |
| Male | 48 (71) |
| Female | 20 (29) |
| Juvenile onset AS, n (%) | 19 (29) |
| Disease duration, mean years (SD) | 8 (7) |
| Dougados functional index, mean (SD) | 12 (9) |
| Neck complaints, n (%) | 56 (82) |
| Peripheral enthesitis, n (%) | 56 (82) |
| Peripheral arthritis, n (%) | 49 (72) |
| Patients with TMJ symptoms, n (%) | 32 (49) |
| Occiput-wall distance, mean, cm (SD) | 1 (3) |
| Modified Schober, mean, cm (SD) | 5.7 (1.7) |
| Radiological sacroiliitis, n (%) | |
| Grade II | 27 (40) |
| Grade III | 31 (45) |
| Grade IV | 10 (15) |
| HLA-B27+, n (%) | 57 (84) |