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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
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

Abstract

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.

Type
Research Article
Copyright
Copyright © The International Society for Twin Studies 1981

References

1. Imaizumi, Y, Inouye, E (1979): Analysis of multiple birthrates in Japan. I. Secular trend, maternal age effect, and geographical variation in twinning rates. Acta Genet Med Gemellol 28:107124.CrossRefGoogle Scholar
2. Imaizumi, Y, Inouye, E, Asaka, A (1982): Mortality rate of Japanese twins and triplets. I. The infant deaths of twins after birth to one year of age. Soc Biol (in press).Google Scholar
3. 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 30:281.CrossRefGoogle ScholarPubMed
4. Japan, Ministry of Health and Welfare (1977): “Survey on Socioeconomic Aspects of Vital Events-Plural Births, 1975.” Tokyo: Health and Welfare Statistics and Information Department, Ministry of Health and Welfare.Google Scholar
5. Sato, R (1947): “Testing Methods of Noncorrelation Coefficient with Applications to Small Sample Sizes,” 4th revised ed. Tokyo: Chubunkan-Shoten Press (in Japanese).Google Scholar
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