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Multiple birth rates in Japan: further analysis.

Y Imaizumi, E Inouye

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1984
    PubMed
    Summary

    Japanese twin and triplet birth rates saw slight decreases, but trizygotic triplets tripled. Japan shows unique patterns in multiple births compared to Caucasian populations, with differing stillbirth trends.

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    Area of Science:

    • Reproductive Biology
    • Human Genetics
    • Demography

    Background:

    • Multiple birth rates and outcomes are influenced by genetic and environmental factors.
    • Understanding population-specific trends in twinning and triplet births is crucial for reproductive health research.

    Purpose of the Study:

    • To analyze secular trends in monozygotic (MZ) and dizygotic (DZ) twin, and triplet births in Japan.
    • To compare Japanese multiple birth rates and origins with Caucasian populations.
    • To examine secular trends in stillbirth rates for twins and triplets.

    Main Methods:

    • Analysis of Japanese birth records from 1955-1967 and 1974.
    • Comparison of MZ and DZ twin rates, and triplet birth rates (including trizygotic triplets).
    • Assessment of stillbirth rates in relation to zygosity, sex, and sex composition of triplets.

    Main Results:

    • Slight decreases in MZ and DZ twin, and overall triplet birth rates, contrasted by a tripling of trizygotic triplet rates.
    • Triplet and quadruplet birth rates in Japan were comparable to Caucasian rates.
    • Japan exhibited higher rates of polyembryonal origin and lower rates of polyovulational origin multiple births compared to Caucasians.
    • Stillbirth rates in twins decreased over time, higher in MZ than DZ twins, and in males.
    • Stillbirth rates in like-sexed triplets mirrored twin trends, while unlike-sexed triplets remained constant; like-sexed triplets had higher stillbirth rates.

    Conclusions:

    • Japanese multiple birth patterns show distinct characteristics, particularly regarding zygosity and origin, compared to Caucasian populations.
    • Stillbirth rates in Japanese twins and triplets have shown a decreasing trend, with variations based on zygosity and sex composition.

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