Abstract
Abstract An analysis of 1,103 fetal and postnatal deaths from spina bifida during 1969‐1975 is presented. The overall birth prevalence rate was 0.75 per 10,000 births and was slightly higher in the southwest than in the northeast of Japan. Social class variation in the prevalence rate during the period was studied. Geographical variation in the prevalence rate of spina bifida is not similar to that of anencephaly, whereas the social class variations in the prevalence rate of the two defects are similar.
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