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Original Article

Secular changes in twinning rates in England and Wales

Pages 485-487 | Received 21 Apr 1980, Published online: 09 Jul 2009
 

Summary

The monozygotic twinning rate in England and Wales seems to have increased over the years 1957–1977. This constitutes evidence against the suggestion that the secular decline in dizygotic twinning rates over the same period has been due to an increase in spontaneous abortion rates.

Zusammenfassung

Die Ziffer der eineiigen Zwillinge scheint in England und Wales über die Jahre 1957–1977 zugenommen zu haben. Dies stellt einen Hinweis gegen die Annahme dar, daß die säkulare Abnahme der Ziffer der zweieiigen Zwillinge über denselben Zeitraum auf eine Zunahme der Ziffer der Spontanaborte zurückzuführen ist.

Résumé

Le taux de gémellité monozygotique en Angleterre et Pays de Galles semble avoir augmenté durant la période 1957–1977. Ceci plaide contre la suggestion que le déclin séculaire des taux de gémellité dizygotique durant la mème période a été dû à une augmentation des taux d'avortement spontané.

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