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Twinning Frequencies in Baden-Wurttemberg According to Maternal Age and Parity from 1955 to 1972

Published online by Cambridge University Press:  01 August 2014

Jens Krueger  and
Peter Propping
Jens Krueger*
Affiliation:
Department of Human Genetics, University of Heidelberg, German Federal Republic
Peter Propping
Affiliation:
Department of Human Genetics, University of Heidelberg, German Federal Republic
*
Department of Human Genetics, Im Neuenheimer Feld 328, D-69 Heidelberg, German Federal Republic

Abstract

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The decline of the twinning rate in Germany since 1900 is exclusively due to a fall of the DZ rate. The analysis of the birth data in Baden-Württemberg from 1955 to 1972 shows that the decline of the DZ twinning rate can be explained only to a small extent by the shift of the maternal age-parity distribution towards younger mothers and lower parities. It appears reasonable that the greater part of this decline is caused by the lessening prevalence of the more fecundable, DZ twin-prone women due to the growing influence of family planning. Furthermore, it is imaginable that the probability for multiple ovulation is decreased after cessation of hormonal contraception.

Type
2. The Twinning Phenomenon
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 25 , Issue 1 , January 1976 , pp. 36 - 40
Copyright
Copyright © The International Society for Twin Studies 1976

References

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