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Analysis of Multiple Birth Rates in Japan. 1. Secular Trend, Maternal Age Effect, and Geographical Variation in Twinning Rates

Published online by Cambridge University Press:  01 August 2014

Yoko Imaizumi  and
Eiji Inouye
Yoko Imaizumi*
Affiliation:
Institute of Population Problems, Ministry of Health and Welfare, Tokyo, Japan
Eiji Inouye
Affiliation:
Institute of Brain Research, University of Tokyo School of Medicine, Tokyo, Japan
*
Institute of Population Problems, 2-2, 1-Chome, Kasumigaseki, Chiyoda-Ku, Tokyo, Japan

Abstract

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Mean twin, triplet, and quadruplet birth rates in Japan from 1951 to 1968 were 6.41, 0.056, and 0.00094 per 1,000, respectively. In 1974 the corresponding figures were 5.83, 0.059, and 0.00329. No quintuplets were born in the former period, but a set was born in the latter year, the rate being 0.47 per million. From 1955 to 1966 the MZ twinning rate increased slightly, but decreased thereafter. This increase was limited to live-born MZ twins, particularly in the higher maternal age groups. The DZ twinning rate declined in the entire period, particularly in higher maternal age groups. This decline appeared to be essentially limited to fetal deaths. Among live births the MZ twinning rate underwent a nearly linear increase with maternal age, whereas the DZ twinning rate attained a mode in the maternal age group 35–39 years. The MZ and the DZ twinning rates among fetal deaths by maternal age had unimodal distributions with modes in maternal age groups 25–29 and 30–34 years, respectively. As to the DZ twinning rate, a geographical cline was noted, with a high rate in the northeast of Japan; the rate was positively correlated with latitude, which also positively correlated with the presence of multiple births among relatives. A negative but nonsignificant correlation was seen between the DZ twinning rate and the proportion of mothers treated with ovulation-inducing hormone. The proportion was higher in mothers of unlike-sexed twins than in those of like-sexed twins and in mothers of triplets than in those of twins. An association between DZ twinning rate and age-specific fertility per married woman is suggested to exist among higher maternal age groups in the northeast part of Japan in earlier years.

Keywords

Twinning ratesSecular trendMaternal ageOvulation-inducing hormonesGeographical variationInheritance of twinning
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 28 , Issue 2 , April 1979 , pp. 107 - 124
Copyright
Copyright © The International Society for Twin Studies 1979

References

REFERENCES

1.Brackenridge, CJ 1977: The secular variation of Australian twin births over fifty years. Ann Human Biol 4:559–564.Google Scholar
2.Bulmer, MG 1960: The twinning rate in Europe and Africa. Ann Hum Genet 24:121–125.CrossRefGoogle ScholarPubMed
3.Czeizel, A, Acsadi, G 1971: Demographic characteristics of multiple births in Hungary. Acta Genet Med Gemellol 20:301–313.Google Scholar
4.Dahlberg, G 1926: Cited by Renkonen (1969): Fertility of mothers with twins. Ann Hum Genet 32:383–389.Google Scholar
5.Davenport, VCB 1930: Litter size and latitude. Arch Rassen Gesellschaftsbiol 24:97–99.Google Scholar
6.Elwood, JM (1973): Changes in the twinning rate in Canada 1926–70. Br J Prev Soc Med 27:236–241.Google ScholarPubMed
7.Goswami, HK 1970: Studies on twins. IV. Twinning in Madhya Pradesh. Acta Genet Med Gemellol 19:465–471.CrossRefGoogle ScholarPubMed
8.Greulich, WW 1934: Heredity in human twinning. Am J Phys Anthropol 19:391–431.Google Scholar
9.Imaizumi, Y, Shinozaki, N, Aoki, H 1975: Inbreeding in Japan: Results of a nation-wide study. Japn J Hum Genet 20:91–107.Google Scholar
10.Inouye, E 1957: Frequency of multiple birth in three cities of Japan. Am J Hum Genet 9:317–320.Google Scholar
11.James, WH 1972: Secular changes in dizygotic twinnning rates. J Biosoc Sci 4:427–434.Google Scholar
12.Japan, Institute of Population Problems (1966): Standardized birth rates by prefectures in 1930, 1950, 1955 and 1960. Institute of Population Problems Research Series, No. 167.Google Scholar
13.Japan, Institute of Population Problems (1967): Indices of population reproductivity for all Japan in 1960–1965. Institute of Population Problems Research Series, No. 178.Google Scholar
14.Japan, Institute of Population Problems (1977): Standardized vital rates by prefectures in 1975. Institute of Population Problems Research Series, No. 215.Google Scholar
15.Japan, Institute of Population Problems (1977): Indices of population for the Japanese population in 1970–1975. Institute of Population Problems Research Series, No. 216.Google Scholar
16.Japan, Ministry of Health and Welfare. Annual (1951–1968): Vital Statistics, Health and Welfare Statistics and Information Department, Ministry of Health and Welfare, Tokyo.Google Scholar
17.Japan, Ministry of Health and Welfare (1977): Survey on Socio-Economic Aspects of Vital Events – Plural Births, 1975. Health and Welfare Statistics and Information Department, Ministry of Health and Welfare, Tokyo.Google Scholar
18.Jeanneret, O, MacMahon, B, (1962): Secuar changes in rates of multiple births in the United States. Am J Hum Genet 14:410–425.Google ScholarPubMed
19.Kamimura, K, (1975): Twin registration and related superstition. Hum Ecol Race Hygiene 41:59–65.Google Scholar
20.Kamimura, K, (1976): Ecological aspects on the twin birth. Niigata Med J 90:293–298 (in Japanese).Google Scholar
21.Komai, T, Fujuoka, G 1936: Frequency of multiple births among the Japanese and related peoples. Am J Phys Anthropol 21:433–447.Google Scholar
22.Sawazaki, C, Tsubata, H (1976): Statistics of multiple births in Japan. Sanka to Fujinka 43:863–869 (in Japanese).Google Scholar
23.Weinberg, W 1901: Beiträge zur Physiologie und Pathololgie der Mehrlingsgeburten beim Menschen. Arch Ges Physiol 88:346–430.Google Scholar
24.Wyshak, G 1975: Some observations on the decline in the United States dizygotic twinning rate. Soc Biol 22:167–172.Google Scholar