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Type: Artigo de periódico
Title: Decline Of The Twinning Rate In Brazil.
Author: Baena de Moraes, M H
Beiguelman, B
Krieger, H
Abstract: The twinning rate during a twenty-year period (1965-1985) was investigated at five-year intervals in four Brazilian hospitals. During this period the twinning rate has decreased significantly (from 10.68% to 8.11%), being highly negatively correlated with the five-year intervals (r = -0.97). This change was due mainly to the decline in dizygotic twinning, since the incidence of DZ twins has fallen from around 7% in 1965 to around 3.6% in 1985. The detected decline in DZ twinning seems to be due to the remotion of the fertility advantage of the more fecundable DZ twin-prone women by the introduction of effective birth control at the present, while some other mechanisms are causing the decline irrespective of the type of twinning.
Subject: Brazil
Infant, Newborn
Maternal Age
Pregnancy, Multiple
Citation: Acta Geneticae Medicae Et Gemellologiae. v. 38, n. 1-2, p. 57-63, 1989.
Rights: fechado
Date Issue: 1989
Appears in Collections:Unicamp - Artigos e Outros Documentos

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