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Effect of a positive ossific nucleus status (ON+) on avascular necrosis development according to age at treatment initiation
| Age at reduction (months) | Relative risk (95 % confidence interval) | P value |
|---|---|---|
| 1–10 | 1.63 (0.37–7.09) | 0.681 |
| 1–18 | 5.35 (1.78–16.09) | 0.002 |
