Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/193880
Type: Artigo de periódico
Title: Annual Variation Of Sex Ratio In Twin Births And In Singletons In Brazil.
Author: Beiguelman, B
Franchi-Pinto, C
Dal Colletto, G M
Krieger, H
Abstract: The annual variation of the sex ratio (SR) of 1385 twin births was analyzed and compared to that of 85909 singletons. These births referred not only to live births but also to stillbirths in two southeastern Brazilian maternity hospitals from 1984 to 1993. While the annual variation of the SR of singletons was very small, that of twin births was extremely high, due to the significant heterogeneity of the annual data. It is suggested that the large SR annual variation of the twin birth might be a consequence of the variation of male or female monozygotic twins. The hypothesis that twin births show a lower sex ratio than singletons could be supported by the present data.
Subject: Adult
Birth Rate
Brazil
Demography
Female
Fetal Death
Humans
Male
Sex Ratio
Twins
Twins, Monozygotic
Americas
Brazil
Comparative Studies
Demographic Factors
Developing Countries
Information
Information Processing
Latin America
Population
Population Characteristics
Records
Research Methodology
Sex Distribution
Sex Factors
Sex Ratio
South America
Studies
Citation: Acta Geneticae Medicae Et Gemellologiae. v. 44, n. 3-4, p. 163-8, 1995.
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/8739727
Date Issue: 1995
Appears in Collections:Unicamp - Artigos e Outros Documentos

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