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Conjoined Twins in Japan, 1979-1985

Published online by Cambridge University Press:  01 August 2014

Yoko Imaizumi
Yoko Imaizumi*
Affiliation:
Institute of Population Problems, Ministry of Health and Welfare, Tokyo, Japan
*
Institute of Population Problems, 2-2 1-Chome, Kasumigaseki, Chiyoda-Ku, Tokyo, Japan

Abstract

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Nation-wide data in Japan on the 112 sets of conjoined twins from fetal deaths and from postnatal deaths during 1979-1985 were analysed. Female conjoined twins accounted for 60% of cases. The incidence rate of conjoined twins remained Constant except in 1985. Overall incidence rate was 10 per million births. Maternal age effect was found in mothers over the age of 40, where the highest incidence rate was obtained. The incidence rate of conjoined twins increased with birth order. There was no seasonal variation in the time of conception.

Keywords

Conjoined twinsMaternal ageBirth orderGeographical variationSeasonality
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 37 , Issue 3-4 , October 1988 , pp. 339 - 345
Copyright
Copyright © The International Society for Twin Studies 1988

References

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