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Estimated Number of Multiplets Under 16 Years Using Two Sets of Census Data in Japan: 1990 and 1995

Published online by Cambridge University Press:  21 February 2012

Yoko Imaizumi
Yoko Imaizumi*
Affiliation:
Faculty of Health Science, Hyogo University, Japan. [email protected]
*
*Address for correspondence: Yoko Imaizumi, Faculty of Health Science, Hyogo University, Kakogawa City, Hyogo Prefecture, 6750101, Japan.

Abstract

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Data for sets of multiples under 16 years of age were obtained from the population censuses of Japan in 1990 and 1995. These numbered 147,188 twin pairs, 1410 sets of triplets, 59 sets of quadruplets, and 3 sets of quintuplets in 1990, with the corresponding numbers in 1995 being 141,354, 2,211, 136 and 12, respectively. The total number of sets of multiples was 148,660 in 1990 and 143,713 in 1995. Twinning, triplet, quadruplet and quintuplet rates were estimated for each age. Rates of monozygotic twins and triplets remained constant age by age up to 15 years, while the dizygotic twinning rate, and rates of di- and tri-zygotic triplets decreased over the same period. Quadruplet and quintuplet rates also decreased. The accuracy of estimating number of multiples from census data is discussed using data on vital statistics.

Type
Articles
Information
Twin Research and Human Genetics , Volume 4 , Issue 4 , 01 August 2001 , pp. 232 - 237
Copyright
Copyright © Cambridge University Press 2001