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Original Article

Recurrence rates in sibships and concordance rates in twins for anencephaly

Pages 79-81 | Received 02 Aug 1977, Published online: 09 Jul 2009
 

Summary

It is suggested that concordance rates in twins for anencephaly are higher than can be explained by the high recurrence rates within sibships, and the hypothesized higher rate of anencephaly in MZ pairs. The evidence is stronger in the case of same-sexed pairs, but points in the same direction for opposite-sexed pairs.

Zusammenfassung

Es wird geschlossen, daß die Konkordanzziffer der Anencephalie bei Zwillingen höher ist, als es durch die hohe Wiederholungszahl bei Geschwistern und die hypothetische höhere Anencephalieziffer bei EZ erklärbar ist. Dies ist bei gleichgeschlechtlichen Paaren deutlicher, zeigt aber bei Pärchen-Zwillingen in die gleiche Richtung.

Résumé

Il est suggéré que les taux de concordance entre jumeaux pour l'anencéphalie sont plus élevés que ne peuvent l'expliquer les taux élevés de récurrence à l'intérieur des fratries et les taux supérieurs supposés de l'anencéphalie dans les paires MZ. Cela ressort plus fortement du cas des paires de me˘me sexe, mais la me˘me direction est indiquée par les paires de sexe opposé.

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