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Multiple Birth Rates in Japan: Further Analysis

Published online by Cambridge University Press:  01 August 2014

Y. Imaizumi  and
E. Inouye
Y. Imaizumi*
Affiliation:
Institute of Population Problems, Ministry of Health and Welfare, Tokyo, Japan
E. Inouye
Affiliation:
Institute for Developmental Research, Aichi Prefectural Colony, Aichi, Japan
*
Institute of Population Problems, Ministry of Health and Welfare, 1-2-2 Kasumigaseki, Chiyoda-Ku, Tokyo 100, Japan

Abstract

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The rates of MZ and DZ twin births and of triplet births slightly decreased in Japan in 1955-1967 and 1974, whereas that of trizygotic triplets tripled. The rates of triplet and quadruplet births were comparable to those of Caucasians. Although the sample size is small, Japan seems to be characterized by higher rates of triplets and quadruplets of polyembryonal origin and lower rates of those of polyovulational origin as compared to Caucasian populations. Stillbirth rates in both MZ and DZ twins gradually decreased in 1960-1967 and 1974. The rate was higher in MZ than DZ twins, and higher in males than females. The secular trends of stillbirth rates in like-sexed triplets was similar to that in twins, whereas the rate in unlike-sexed triplets remained almost constant for the entire period. The rate was higher in like-sexed than unlike-sexed triplets.

Keywords

Twinning ratesStillbirth ratesMaternal ageBirth order
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 33 , Issue 1 , January 1984 , pp. 107 - 114
Copyright
Copyright © The International Society for Twin Studies 1984

References

REFERENCES

1.Brackenridge, CJ (1978): Aspects of the increasing triplet rate in Australia. J Biosoc Sci 10:183–188.Google Scholar
2.Bulmer, MG (1970): The Biology of Twinning in Man. Oxford: Clarendon Press.Google Scholar
3.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 Scholar
4.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
5.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
6.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
7.Imaizumi, Y, Asaka, A, Inouye, E (1980): Analysis of multiple birth rates in Japan. V. Seasonal and social class variations in twin births. Jpn J Hum Genet 25:299–307.Google Scholar
8.Imaizumi, Y, Inouye, E, Asaka, A (1981): Mortality rate of Japanese twins and triplets. II. Socioeconomic factors influencing infant deaths of twins after birth to one year of age. Acta Genet Med Gemellol 30:275–280.Google Scholar
9.Imaizumi, Y, Inouye, E, Asaka, A (1981): Mortality rate of Japanese twins and triplets. III. Infant deaths of triplets after birth to one year of age. Acta Genet Med Gemellol 30:281–284.Google Scholar
10.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
11.Imaizumi, Y, Asaka, A, Inouye, E (1982): Analysis of multiple birth rates in Japan. VII. Rates of spontaneous and induced terminations of pregnancy in twins. Jpn J Hum Genet 27:235–242.CrossRefGoogle ScholarPubMed
12.Imaizumi, Y, Inouye, E, Asaka, A (1982): Mortality rate of Japanese twins: infant deaths of twins afterbirth to one year of age. Soc Biol 28:176–186.Google Scholar
13. Japan, Ministry of Health and Welfare: Vital Statistics, Health and Welfare Statistics and Information Department, Ministry of Health and Welfare, Tokyo. Annual, 1951–1968 and 1974.Google Scholar
14.Japan, Ministry of Health and Welfare: Survey on Socio-Economic Aspects of Vital Events – Plural Births, 1975. Health and Welfare Statistics and Information Department, Ministry of Health and Welfare, Tokyo, 1977.Google Scholar