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10,000 liveborn babies resulting from preg nancies of 28 of more weeks were examined by a team of 3 pediatricians, 1 orthopedic surgeon, 1 pediatric cardiologist, and 1 urologist in order to find the incidence of various congenital malformations. Relatively high incidence rates for imperforate anus and polydactyly were encountered (1.1 and 2.6/1,000 births, respectively). The rates for anencephaly and congenital heart disease were also found to be somewhat higher than those reported for most white populations.
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Say et al. (1973) studied this question.
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