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| Impairment categories | LCPD group | Control group | p-value |
|---|---|---|---|
| Mild (1 to 4), n (%) | 4 (16) | 17 (68) | 0.002 |
| Moderate (5 to 7), n (%) | 6 (24) | 4 (16) | |
| Severe (8 to 10), n (%) | 5 (20) | 2 (8) | |
| Very severe (11 to 13), n (%) | 5 (20) | 1 (4) | |
| Extremely severe (≥ 14), n (%) | 5 (20) | 1(4) |
Abbreviations: LCPD, Legg-Calvé-Perthes disease.
