Hostname: page-component-76fb5796d-vfjqv Total loading time: 0 Render date: 2024-04-27T20:28:50.124Z Has data issue: false hasContentIssue false
  • English
  • Français

Annual Variation of Sex Ratio in Twin Births and in Singletons in Brazil

Published online by Cambridge University Press:  01 August 2014

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

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 not be supported by the present data.

Keywords

Sex ratioTwin birthsSingletonsMaternal ageMonozygotic and Dizygotic Twins
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 44 , Issue 3-4 , October 1995 , pp. 163 - 168
Copyright
Copyright © The International Society for Twin Studies 1995

References

REFERENCES

1. Allen, G, Parisi, P (1990): Trends in monozygotic and dizygotic twinning rates by maternal age and parity. Further analysis of Italian data, 1949-1985, and rediscussion of US data, 1964-1985. Acta Genet Med Gemellol 39: 317–328.Google Scholar
2. Barr, A, Stevenson, AC (1961): Stillbirths and infant mortality in twins. Ann Hum Genet 25: 131–140.Google Scholar
3. Beatty, RA (1974): Genetic aspects of spermatozoa. In Coutinho, EM, Fuchs, FC (eds.): Physiology and Genetics of Reproduction, Part A. New York: Plenum Press, pp 183–196.Google Scholar
4. Beiguelman, B, Villarroel-Herrera, HO (1992): Sex ratio of twins in a southeastern Brazilian population. Rev Brasil Genet 15: 707–711.Google Scholar
5. Belitzki, R, Fescina, R, Ucieda, F (1978): Definiciones y terminologias aplicables al periodo perinatal. Recomendaciones de la Organización Mundial de la Salud y Modificaciones de la FIGO. Publicación Científica del CLAP N° 757: 136–147.Google Scholar
6. Bernstein, ME (1958): Studies in the human sex ratio: a genetic explanation of the wartime increase in the secondary sex ratio. Am J Hum Genet 10: 68–70.Google ScholarPubMed
7. Bertranpetit, J, Marin, A (1988): Demographic parameters and twinning: a study in Catalonia, Spain. Acta Genet Med Gemellol 37: 127–135.Google ScholarPubMed
8. Ciocco, A (1940): Sex differences in morbidity and mortality. Quant Rev Biol 15: 59–73; 192–210.Google Scholar
9. Czeizel, A (1974): Unexplainable demographic phenomena of multiple births in Hungary. Acta Genet Med Gemellol 22 (Suppl.): 214–218.Google Scholar
10. Guerrero, R (1970): Sex-ratio: a statistical association with the type and time of insemination in the menstrual cycle. Int J Fertil 15: 221–225.Google Scholar
11. Gerrero, R (1974): Association of the type and time of insemination within the menstrual cycle with the human sex-ratio at birth. N Engl J Med 291: 1056–1059.CrossRefGoogle Scholar
12. James, WH (1971): Cycle day of insemination, coital rate and sex ratio. Lancet 1: 112–114.Google Scholar
13. James, WH (1975): Sex ratio in twin births. Ann Hum Biol 2: 365–378.Google Scholar
14. James, WH (1976): Timing of fertilization and sex ratio of offspring. A review. Ann Hum Biol 3: 549–556.Google Scholar
15. James, WH (1980): Sex ratio and placentation in twins. Ann Hum Biol 7: 273–276.Google Scholar
16. Lee, S, Takano, K (1970): Sex ratio in human embryos obtained from induced abortion: histological examination of the gonad in 1,452 cases. Amer J Obstet Gynecol 108: 1294–1296.Google Scholar
17. Mellender-Araújo, A (1973): Estrutura populacional e malformações congênitas na população de Porto Alegre. Doctoral Thesis, Federal University of Rio Grande do Sul, Brazil.Google Scholar
18. Pedreira, CM, Peixoto, LIS, Ito-Rocha, LMG (1959): Estudo da gemelaridade na população de Salvador, Bahia. Anais I Reunião Brasil. Genet Hum (Curitiba): 137–140.Google Scholar
19. Renkonen, KO (1964): Problems connected with the birth of male children. Acta Genet 14: 177–185.Google ScholarPubMed
20. Renkonen, KO (1970): Heterogeneity among first post-nuptial deliveries. Ann Hum Genet 33: 319–321.Google Scholar
21. Rola-Janicki, A (1974): Multiple births in Poland in 1949-1971. Acta Genet Med Gemellol 22 (Suppl.): 202–209.Google Scholar
22. Stocks, P (1952): Recent statistics of multiple births in England and Wales. Acta Genet Med Gemellol 1: 8–13.CrossRefGoogle ScholarPubMed
23. Susanne, C, Corbisier, JV (1969): Les naissances gémellaires en Belgique (1960-1961). Acta Genet Med Gemellol 18: 294–320.Google Scholar
24. Tietze, C (1948): A note on the sex ratio of abortions. Human Biol 20: 156–160.Google Scholar
25. Weinberg, W (1901): Beiträge zur Physiologie und Pathologie der Mehrlingsgeburten beim Menschen. Pflügers Arch f Ges Physiol 88: 346–430.Google Scholar
26. Woolf, B (1955): On estimating the relation between blood group and disease. Ann Hum Genet 19: 251–253.CrossRefGoogle ScholarPubMed