Table 4.
Annual income of the parents in relation to the incidence (per 100,000) of Perthes’ disease
| Income | Men | Women |
|---|---|---|
| ≤ 10th percentile | 9.2 | 8.3 |
| > 10th and <90th percentile | 9.6 | 9.5 |
| ≥ 90th percentile | 7.7 | 9.5 |
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