Main features of the 90 patients with SAPHO syndrome.
| Gender (sex ratio) | 25 men/65 women (0.4) |
| Age at first symptom (yrs) | 32* (9–57) |
| Age at autoantibody testing (yrs) | 42* (15–74) |
| Disease duration (yrs) | 7* (1–56) |
| Patients previously treated with ANA-inducing drugs | 17 (18.9%) |
↵* Mean (range). SAPHO: synovitis, acne, pustulosis, hyperostosis, osteitis.