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Decline of the Twinning Rate in Brazil

Published online by Cambridge University Press:  01 August 2014

M.H. Baena de Moraes ,
B. Beiguelman  and
H. Krieger
M.H. Baena de Moraes
Affiliation:
Department of Medical Genetics, School of Medicine, UNICAMP, Campinas
B. Beiguelman*
Affiliation:
Department of Medical Genetics, School of Medicine, UNICAMP, Campinas
H. Krieger
Affiliation:
Department of Genetics, FIOCRUZ, Rio de Janeiro, Brazil
*
Dept. of Medical Genetics, Faculty of Medical Sciences UNICAMP, CP 1170, 13081 Campinas, SP, Brazil

Abstract

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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.

Keywords

Twinning rateFecundityMaternal ageParityContraception
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 38 , Issue 1-2 , April 1989 , pp. 57 - 63
Copyright
Copyright © The International Society for Twin Studies 1989

References

REFERENCES

1. Akanlawon, AO, Ejiwunmi, AB (1986): Biological factors in multiple births in Lagos. East Afr Med J 63:115–120.Google Scholar
2. Allen, G, Schachter, J (1971): Ease of conception in mothers of twins. Soc Biol 18:18–27.Google Scholar
3. Azubuike, JC (1982): Multiple births in Igbo women. Brit J Obstet Gynaecol 89:77–79.Google Scholar
4. Beiguelman, B, Marchi, A, Hama, T, Amin, CC, Godoi, MNC, Baptista, TA (1965): Fecundidadee lepra. Revta Paul Med 66:207–213.Google Scholar
5. Bulmer, MG (1959): The effect of parental age, parity and duration of marriage on the-twinning rate. Ann Hum Genet 23:454–458.Google Scholar
6. Czeizel, A, Acsadi, G (1971): Demographic characteristics of multiple births in Hungary. Acta Genet Med Gemellol 20:301–313.CrossRefGoogle Scholar
7. Doherty, JDH, Lancaster, PAL (1986): The secular trend of twinning in Australia, 1853-1982. Acta Genet Med Gemellol 35:61–76.Google Scholar
8. Elwood, JM (1971): Changes in the twinning rate in Canada 1926-70. Brit J Prev Soc Med 27:236–241.Google Scholar
9. Eriksson, AW, Fellman, J (1967): Twinning and legitimacy. Hereditas 57:395–402.Google Scholar
10. Eriksson, AW, Fellman, J (1973): Differences in the twinnin trends between Finns and Swedes. Am J Hum Genet 25:141–151.Google Scholar
11. Goswami, HK, Wagh, KV (1975): Twinning in India. Acta Genet Med Gemellol 24:347–350.Google Scholar
12. Hémon, D, Berger, C, Lazar, P (1981): Some observations concerning the decline of dizygotic twinning rate in France between 1901 and 1968. In Gedda, L, Parisi, P, Nance, WE (eds.): Twin Research 3: Twin Biology and Multiple Pregnancy. New York: Alan R Liss, pp 49–56.Google Scholar
13. Hémon, D; Berger, C, Lazar, P (1981): Twinning following oral contraceptive discontinuation. Int J Epidemiol 10:319–328.CrossRefGoogle ScholarPubMed
14. Imaizumi, Y, Inouye, E (1979): Analysis of multiple birth rates in Japan. Acta Genet Med Gemellol 28:107–124.Google Scholar
15. James, WH (1972): Secular changes in dyzigotic twinning rates. J Biosoc Sci: 4:427–434.Google Scholar
16. James, WH (1975): The secular decline in dizygotic twinning rates in Italy. Acta Genet Med Gemellol 24:9–14.Google Scholar
17. James, WH (1980): Secular changes in twinning rates in England and Wales. Ann Hum Biol 7:485–487.Google Scholar
18. James, WH (1982): Second survey of secular trends in twinning rates. J Biosoc Sci 14:481–497.Google Scholar
19. James, WH (1984): Twins. N Engl J Med 311:58.Google Scholar
20. James, WH (1986): Recent secular trends in dizygotic twinning rates in Europe. J Biosoc Sci: 18:497–504.Google Scholar
21. Jeanneret, O, MacMahon, B (1962): Secular changes in rates of multiple births in the United States. Am J Hum Genet 14:410–425.Google Scholar
22. Katsouyiannopoulos, V (1981): The falling twin rate in Greece. J Epidemiol Community Health 35:218–219.Google Scholar
23. Khoury, MJ, Erikson, JD (1983): Maternal factors in dizygotic twinning: evidence from interracial crosses. Ann Hum Biol 10:409–416.Google Scholar
24. Lazar, P (1976): Effet des avortements spontanés sur la fréquence des naissances gémellaires. C R Acad Sci 282:243–246.Google Scholar
25. Mosteller, M, Townsend, I, Corey, A, Nance, WE (1981): Twinning rates in Virginia: secular trends and the effects of maternal age and parity. In Gedda, L, Parisi, P, Nance, WE (eds.): Twin Research 3: Twin Biology and Multiple Pregnancy. New York: Alan R Liss, pp 57–69.Google Scholar
26. Parisi, P, Caperna, G (1981): The changing incidence of twinning: one century of Italian statistics. In Gedda, L, Parisi, P, Nance, WE (eds.): Twin Research 3: Twin Biology and Multiple Pregnancy. New York: Alan R. Liss, pp 35–48.Google Scholar
27. Parisi, P, Caperna, G (1982): Twinning rates, fertility, and industrialization: a secular study. In Bonné-Tamir, B (ed.): Human Genetics, Part A: The Unfolding Genome. New York: Alan R. Liss, pp 375–394.Google Scholar
28. Weinberg, W (1901): Beiträge zur Physiologie und Pathologie der Mehrlingsgeburtn Menschen. Pflügers Arch 88:346–340.Google Scholar