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Investigation on Seasonality of Twin Births in Brazil

Published online by Cambridge University Press:  01 August 2014

H. Krieger ,
G. M. D. D. Colletto ,
C. Franchi-Pinto  and
B. Beiguelman
H. Krieger
Affiliation:
Department of Parasitology, University of Sāo Paulo, S. Paulo, SP, Brazil
G. M. D. D. Colletto
Affiliation:
Department of Parasitology, University of Sāo Paulo, S. Paulo, SP, Brazil
C. Franchi-Pinto
Affiliation:
Department of Medical Genetics, School of Medicine, UNICAMP, Campinas, SP, Brazil
B. Beiguelman*
Affiliation:
Department of Medical Genetics, School of Medicine, UNICAMP, Campinas, SP, Brazil
*
Departamento de Genética Médica, Faculdade de Ciências Médicas, C.P. 6111, UNICAMP, 13081-970 Campinas, SP, Brazil.

Abstract

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The hypothesis of seasonality of twin births was investigated in two important maternity hospitals in the State of Sāo Paulo, Brazil. The study included 1,386 twin births that occurred among 154,699 deliveries from 1984 to 1993. No evidence of seasonality has been detected either for the twin birth rate considered as a whole or for dizygotic twinning rate. The distributions of these rates fitted well sinusoidal regression curves but the cyclic trend did not correspond to any specific season.

Keywords

SeasonalityPeriodicityCyclic variationTwin birthsDizygotic rateTwin births in southeastern Brazil
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 45 , Issue 4 , October 1996 , pp. 397 - 403
Copyright
Copyright © The International Society for Twin Studies 1996

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