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Incidence rates of neural tube defects in Japan. Yoko IMAIZUMI 1 1Institute of Population Problems, Ministry of Health and Welfare pp.907-913
Published Date 1988/12/10
DOI https://doi.org/10.11477/mf.1431906237
  • Abstract
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Nation-wide data in Japan on pre- and post-natal deaths of 15, 563 cases with anencephalus, 2, 137 cases with spina bifida, and 6,976 cases with congenital hydrocephalus during 1969-1985 were analysed. The incidence rate of anencephalus increased with the year until 1981 and decreased thereafter. Incidence rates for spina bifida and congenital hydrocephalus decreased year by year. The sex ratio for anencephalus and congenital hydrocephalus indicated male preponderance, whereas female preponderance was obtained for spina bifida.

The occupation of the head of household was classified into six groups according to the classification on the death certificate. The highest incidence rates were obtained in class VI, I, and I & VI for anencephalus, spina bifida, and congenital hydrocephalus, respectively. On the other hand, the lowest incidence rates for the corresponding neural tube defects were obtained in classes II, III, and IV, respectively.


Copyright © 1988, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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