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Yearly Changes in Stillbirth Rates of Zygotic Twins in Japan, 1975-1994

Published online by Cambridge University Press:  01 August 2014

Y. Imaizumi  and
K. Nonaka
Y. Imaizumi*
Affiliation:
National Institute of Populationand Social Security Research, Ministry of Health and Welfare, Kasumigaseki, Chiyoda-ku, Tokyo
K. Nonaka
Affiliation:
Department of Hygiene, Teikyo University, School of Medicine, kaga, Itabashi-ku, Tokyo, Japan
*
National Institute of Populationand Social Research, Ministry of Health and Welfare, Kasumigaseki, Chiyoda-ku, Tokyo, Japan

Abstract

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The stillbirth rates decreased to 2/3 for MZ male twins, 1/2 for MZ female twins, and under 1/2 for DZ twins for both sexes during the 19-year period from 1975 in Japan. The stillbirth rate was significantly higher in MZ males than MZ females in each year, whereas stillbirth rates of DZ twins for both sexes indicated similar values during that period. After 1986, stillbirth rates were more than 2 times higher in MZ twins than in singletons and in DZ twins. The higher stillbirth rate of MZ twins as opposed to DZ twins could be related to monochorionic twin pairs in MZ twins. The stillbirth rate decreased more drastically in twins for both zygosities than in singleton births during the 34-year period from 1960. However, declining rates of stillbirths may be attributed to medical care during twin pregnancies. Recommendation of an optimum day to give birth for twin pregnancy is 37-38 weeks for Japanese women.

Keywords

Stillbirth ratesTwinsZygosityTrendsMaternal ageGestational ageBirthweight
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 47 , Issue 1 , January 1998 , pp. 19 - 30
Copyright
Copyright © The International Society for Twin Studies 1998

References

REFERENCES

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