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The First Five Years of the Budapest Twin Register, 1970–1974

Published online by Cambridge University Press:  01 August 2014

A. Czeizel ,
I. Pazonyi ,
J. Métneki  and
M. Tomka
A. Czeizel
Affiliation:
Laboratory of Human Genetics, National Institute of Hygiene, and Heim Pái Children's Hospital, Budapest
I. Pazonyi
Affiliation:
Laboratory of Human Genetics, National Institute of Hygiene, and Heim Pái Children's Hospital, Budapest
J. Métneki
Affiliation:
Laboratory of Human Genetics, National Institute of Hygiene, and Heim Pái Children's Hospital, Budapest
M. Tomka
Affiliation:
Laboratory of Human Genetics, National Institute of Hygiene, and Heim Pái Children's Hospital, Budapest

Abstract

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The Budapest Twin Register recorded 88.6% of the 1739 multiple births that occurred between 1970 and 1974. Of these, 31.2% were male-female pairs. Based on the examination of the placenta (19.8% monochorial) and of genetic markers, 406 pairs proved to be monozygotic and 645 dizygotic. Sex ratio of twins at birth showed a female preponderance (1000 F: 1009 M) in comparison to singletons (1000 F: 1071 M). Average birth weight of the twins was 2101 g. The frequency of stillbirths was about four times higher in twins than in singletons, twice as high in monozygotic than in dizygotic twins, and 2.4 times higher among second than first-born twins.

Keywords

Twin registersTwinning ratesHungaryZygosity determinationSex ratioStillbirth rateSeasonality
Type
Brief-Report
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 28 , Issue 1 , January 1979 , pp. 73 - 76
Copyright
Copyright © The International Society for Twin Studies 1979