Summary of published recurrence risks for mental retardation by sex of proband
| Reference | Affected male | Affected female | ||||
|---|---|---|---|---|---|---|
| Brother | Sister | All siblings | Brother | Sister | All siblings | |
| Turner et al82 | 2–9% | 3.5–4% | ||||
| Bundey et al83 | 6.7% | 3.2% | 5% | 4.4% | 6.3% | 5.4% |
| Herbst et al84 | 6% | 2.3% | 4.3% | 2.9% | 5.6% | 4.2% |
| Bundey et al85 | 10% | 5% | 7.5% | |||
| Costeff et al86 | 14% | 14% | 14% | 9.6% | 9.6% | 9.2% |
| Van Naarden Braun et al88 | 8.4% | 8.4% | ||||