Characteristics | Cases N(%) | Controls N(%) | p-value |
---|---|---|---|
Number | 308 | 423 | Â |
Age, year (mean ± SD) | 43.47 ± 11.303 | 42.52 ± 13.135 | 0.396 |
>  45 | 133 (43%) | 198 (47%) |  |
≤ 45 | 175 (57%) | 225 (53%) |  |
Hip lesions | |||
 Unilateral | 66 (21%) |  |  |
 Bilateral | 242 (79%) |  |  |
Clinical stages | |||
 III/IV | 218 (71%) |  |  |
 I/II | 90 (29%) |  |  |