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The Recent Trends in Multiple Births and Stillbirth Rates in Japan

Published online by Cambridge University Press:  01 August 2014

Y. Imaizumi
Y. Imaizumi*
Affiliation:
Institute of Population Problems, Ministry of Health and Welfare, Tokyo, Japan
*
Institute of Population Problems, Ministry of Health and Welfare, Kasumigaseki, Chiyoda-ku, Tokyo, Japan

Abstract

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The twinning rate remained nearly Constant up to 1968, then decreased in 1974 and gradually increased with the year. The triplet birth rate remained nearly Constant up to 1974, then increased up to 1982, where the rate was 1.8 times higher than in 1968, and decreased thereafter. On the other hand, the quadruplet birth rate remained nearly Constant up to 1968, was eightfold in 1975, then decreased until 1984 and suddenly increased to 8 per million births in 1985. The higher multiple birth rates since 1974 was attributed to the higher proportion of mothers treated with ovulation-inducing hormones in Japan. The stillbirth rates decreased to 2/5 for male twins and to 1/3 for female twins during the 25-year period from 1960, to 2/5 for triplets and to 1/5 for quadruplets during the 34-year period from 1951.

Keywords

Twinning ratesMultiple birth ratesStillbirth rates
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 36 , Issue 3 , July 1987 , pp. 325 - 334
Copyright
Copyright © The International Society for Twin Studies 1987

References

REFERENCES

1.Aono, T, Miyake, A (1986): Multiple pregnancies following induced ovulation. Sanfujinka Chiryo 52:24–28 (in Japanese).Google Scholar
2.Aono, T (1986): Unpublished data.Google Scholar
3.Aono, T: Personal communication.Google Scholar
4.Imaizumi, Y, Inouye, E (1979): Analysis of multiple birth rates in Japan. I. Secular trend, maternal age effect, and geographical variation in twinning rates. Acta Genet Med Gemellol 28:107–124.Google ScholarPubMed
5.Imaizumi, Y, Asaka, A, Inouye, E (1980): Analysis of multiple birth rates in Japan. II. Secular trend and effect of birth order, maternal age, and gestational age in stillbirth rate of twins. Acta Genet Med Gemellol 29:223–231.Google Scholar
6.Imaizumi, Y, Inouye, E (1980): Analysis of multiple birth rates in Japan. III Secular trend, maternal age effect, and geographical variation in triplet rates. Jpn J Hum Genet 25:73–81.CrossRefGoogle ScholarPubMed
7.Imaizumi, Y, Inouye, E (1980): Analysis of multiple birth rates in Japan. IV. Secular trend, effect of maternal age and gestational age in stillbirth rates of triplets. Jpn J Hum Genet 25:219–227.CrossRefGoogle ScholarPubMed
8.Imaizumi, Y, Inouye, E (1982): Analysis of multiple birth rates in Japan. VI. Quadruplets: birth and stillbirth rates. Jpn J Hum Genet 27:227–234.CrossRefGoogle ScholarPubMed
9.Japan, Ministry of Health and Welfare: Vital Statistics. Annual, 1951-1968 and 1974-1984. Tokyo: Health and Welfare Statistics and Information Department, Ministry of Health and Welfare.Google Scholar
10.Japan, Ministry of Health and Welfare (1977): Survey on Socio-Economic Aspects of Vital Events Plural Births, 1975. Tokyo: Health and Welfare statistics and Information Department, Ministry of Health and Welfare.Google Scholar
11.Kurachi, Ket al (1983): The outcome of pregnancy following medical treatment to the HMG (Humegon) – HCG. Sanka to Fujinka 50:274–281 (in Japanese).Google Scholar
12.Taymor, ML (1975): Selection of agents for ovulation induction. In Taymor, , Geen, (eds): Progress in Gynecology, Vol. 6. New York: Grune and Stratton, pp 269–290.Google Scholar
13.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, pp 17–33.Google Scholar