Table 3.
Educational level of the parents in relation to the incidence (per 100,000) of Perthes’ disease
| Years of education | Men | Women |
|---|---|---|
| < 11 | 11.5 | 12.2 |
| 11–13 | 9.4 | 10.0 |
| ≥ 14 | 7.7 | 7.3 |
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