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|Type:||Artigo de periódico|
|Title:||Decline Of The Twinning Rate In Brazil.|
|Author:||Baena de Moraes, M 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.|
|Citation:||Acta Geneticae Medicae Et Gemellologiae. v. 38, n. 1-2, p. 57-63, 1989.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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