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Patient demographics
| Parameter | Value |
|---|---|
| Mean age at initial diagnosis, yrs (sd; range) | 45.5 (14.9; 15 to 86) |
| Hips, n | |
| Total | 505 |
| Male:female | 233:272 |
| Patients, n | |
| Total | 310 |
| Male:female | 141:169 |
| Hips: bilateral cases, n | |
| Total | 390 |
| Male:female | 184:206 |
| Hips: unilateral cases, n | |
| Total | 115 |
| Male:female | 49:66 |
| Background factors | |
| Hips: steroid use, n | 390 |
| Hips: alcohol intake, n | 83 |
| Hips: idiopathic, n | 32 |
