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A Comparative Study of Twinning and Triplet Rates in 17 Countries, 1972-1996

Published online by Cambridge University Press:  01 August 2014

Y. Imaizumi
Y. Imaizumi*
Affiliation:
National Institute of Population and Social Security Research, Ministry of Health and Welfare, Tokyo, Japan
*
Hyogo University, Hiraoka-cho, Kakogawa City, Hyogo Prefecture, 675-0101, Japan; e-mail: [email protected]

Abstract

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Secular changes in twinning and triplet rates were analyzed using vital statistics in Austria, the Czech Republic, the Slovak Republic, England and Wales, Germany, the Netherlands, Switzerland, Denmark, Finland, Norway, Sweden, Canada, Australia, Hong Kong, Israel, Japan, and Singapore during the period from 1972 to 1996. Among those 17 countries, the twinning and triplet rates in the Czech Republic and in the Slovak Republic remained constant from 1972 to 1994, whereas these rates increased significantly year by year in the other 15 countries during the examined period in each country. Twinning rates increased from 1.2-fold in Austria to 2-fold in Denmark from 1972 to 1996. As for triplets, the rate increased from 3-fold in Denmark to 9-fold in Norway during that period. With one exception, that being the Slovak Republic, the triplet rate was highest in the Scandinavian countries, followed by the other European and Asian countries. The rising twinning and triplet rates have been attributed to the higher proportion of mothers treated with ovulation-inducing hormones and partially attributed to IVF.

Keywords

Twinning rateTriplet rateEpidemiologyWorldwide
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 47 , Issue 2 , April 1998 , pp. 101 - 114
Copyright
Copyright © The International Society for Twin Studies 1998

References

REFERENCES

1.Bulmer, MG (1970): The Biology of Twinning in Man. Oxford, England: Clarendon Press.Google Scholar
2.Wyshak, G (1978): Statistical findings on the effects of fertility drugs on plural births. In Nance, WE, Allen, G., Parisi, P. (eds): Twin Research: Part B, Biology and Epidemiology. New York: Alan R. Liss, 17–33.Google Scholar
3.Elsner, CW, Tucker, MJ, Sweitzer, CL, et al. (1997): Multiple pregnancy rate and embryo number transferred during in vitro fertilization. Am J Obstet Gynecol 177: 350–357.CrossRefGoogle ScholarPubMed
4.Werler, MM, Cragan, JD, Wasserman, CR, Shaw, GM, Erickson, JD, Mitchell, AA (1997): Multivitamin supplementation and multiple births. Am J Med Genet 71: 93–96.Google Scholar
5.Ceizel, AE (1998): Periconceptional folic acid containing multivitamin supplementation. Eur J Obstet Gynecol Reprod Biol 78: 151–161.Google Scholar
6.Imaizumi, Y (1992): Twinning rates in Japan, 1951-1990. Acta Genet Med Gemellol 41: 165–175.Google ScholarPubMed
7.Imaizumi, Y (1994): Recent and long term trends of multiple birth rates and influencing factors in Japan. J of Epidemiology 4: 103–109.CrossRefGoogle Scholar
8.Imaizumi, Y, Nonaka, K (1997): Rising trizygotic triplet rates in Japan, 1975-1994. Acta Genet Med Gemellol 46: 87–98.Google ScholarPubMed
9.Chen, CJ, Lin, TM, Chang, C, Cheng, YJ (1992): Epidemiological characteristics of twinning rates in Taiwan. Acta Genet Med Gemellol 36: 335–342.Google Scholar
10.Westergaard, T, Wohlfahrt, J, Aaby, P, Melbye, M. (1997): Population based study of rates of multiple pregnancies in Denmark, 1980-91. BMJ 314: 775–779.Google Scholar
11.Taffel, SM (1992): Health and demographic characteristics of twin births: United States, 1988. Vital and Health Statistics, Series 21, N. 50, 1–17.Google ScholarPubMed
12.Wood, R (1997): Trends in multiple births, 1938-1995. Population Trends 87 (Spring): 29–35.Google Scholar
13.Murphy, M, Hey, K, Brown, J, Willis, B, Ellis, JD, Barlow, D (1997): Infertility treatment and multiple birth rates in Britain, 1938-94. J Biosoc Sci 29: 235–243.Google Scholar
14.Imaizumi, Y (1997): Trends of twinning rates in ten countries, 1972-1996. Acta Genet Med Gemellol 46: 209–218.Google Scholar
15.Imaizumi, Y (1999): Constant multiple birth rates in the Czech Republic and the Slovak Republic until recently, 1972-1995. Twin Research 2: 10–15.CrossRefGoogle ScholarPubMed
16.World Collaborative Report 1993. International Working Group for Registers on Assisted Reproduction.Google Scholar
17.Westergaard, LG, Rasmussen, PE, Maigaard, S, Ingerslev, HJ, Andersen, AN, Larsen, JFet al. (1993): In vitro fertiliserng. En oversigt over medicinske indikationer og forslag til falles retningslinier ved de offentlige danske fertilitetsklinikker. Ugeskr Laeger 155:251–2514 (In Danish).Google Scholar
18.Imaizumi, Y, Nonaka, K (1997): The twinning rates by zygosity in Japan, 1975-1994. Acta Genet Med Gemellol 46: 9–22.Google Scholar
19.Pollard, R (1995): Ethnic comparison of twinning rates in California. Human Biology 67: 921–931.Google ScholarPubMed
20.Imaizumi, Y, Inouye, E (1981): Analysis of multiple birth rates in Japan. III. Secular trend, maternal age effect and geographical variation in triplet rates. Jpn J Human Genet 25: 73–81.Google Scholar