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Twinning Rate in a Southeastern Brazilian Population

Published online by Cambridge University Press:  01 August 2014

B. Beiguelman ,
C. Franchi-Pinto ,
H. Krieger  and
L.A. Magna
B. Beiguelman
Affiliation:
Department of Medical Genetics, School of Medicine, UNICAMP, Campinas, SP, Brazil
C. Franchi-Pinto
Affiliation:
Department of Medical Genetics, School of Medicine, UNICAMP, Campinas, SP, Brazil
H. Krieger
Affiliation:
Department of Parasitology, University of S. Paulo, S. Paulo, SP, Brazil
L.A. Magna
Affiliation:
Department of Medical Genetics, School of Medicine, UNICAMP, Campinas, SP, Brazil

Abstract

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The twinning incidence from 1984 to 1993 was investigated in Campinas, State of São Paulo, Brazil, and the analyzed data were combined with previous series from the same population. This study has shown that the mean annual incidences and the standard deviations for DZ, MZ and DZ plus MZ twins for the period of 1984 to 1993 are estimated respectively as 4.7 ± 0.92, 4.1 ± 1.11, and 8.8 ± 0.87 per 1,000. In the same period the mean annual incidence of triplets was 0.15 ± 0.16. It was also shown that the incidence of DZ twins is steadily decreasing since 1925, while the incidence of MZ pairs, after a period of decline is increasing since the sixties, due perhaps to the widespread use of oral contraceptives. Concerning the twinning rate as a whole, it has been shown that its declining trend has disappeared over the last few years.

Keywords

Twinning rateDizygotic twinning rateMonozygotic twinning rateMultiple birthsSecular trendOral contraceptivesMaternal ageFecundity
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 45 , Issue 3 , July 1996 , pp. 317 - 324
Copyright
Copyright © The International Society for Twin Studies 1996

References

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