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Mortality Rate of Japanese Twins and Triplets III. Infant Deaths of Triplets After Birth to One Year of Age

Published online by Cambridge University Press:  01 August 2014

Yoko Imaizumi ,
Eiji Inouye  and
Akio Asaka
Yoko Imaizumi*
Affiliation:
Institute of Population Problems, Ministry of Health and Welfare, Tokyo
Eiji Inouye
Affiliation:
Institute for Developmental Research, Aichi Prefectural Colony, Aichi
Akio Asaka
Affiliation:
Institute of Brain Research, University of Tokyo School of Medicine, Tokyo
*
Institute of Population Problems, Ministry of Health and Welfare, 1-2-2 Kasumigaseki, Chiyoda-ku, Tokyo 100, Japan

Abstract

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The rate of infant mortality of triplet individuals (deaths under one year of age) was computed using 34 sets of triplets born in the first half of 1974. The rates were 8.82%, 9.68%, and 10.34% for the first-, second-, and the third-born triplets, respectively. For males and females the rates were 8.33% and 10.34%, respectively, and the difference was not significant. The rate decreased with gestational age up to 32-35 weeks. For those with heavier weight at birth (≤2,000 g) the rate was lower (0%) than for those with lighter weight (<2,000 g, 8.16%), but the difference is not significant (P = 0.087). Infant mortality rate of triplets decreased with increased monthly expenditure of the household.

Keywords

Infant mortalityTripletsSocioeconomic factors
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 30 , Issue 4 , October 1981 , pp. 281 - 284
Copyright
Copyright © The International Society for Twin Studies 1981

References

REFERENCES

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