Secular trends in uncertain-sex births and proportion of male births in Norway, 1967-1998.


It has been hypothesized that environmental factors influence sex differentiation in the fetus, thus causing a reduced sex ratio (male/female) at birth, an increase in the prevalence of ambiguous-sex infants, and possibly an increase in spontaneous abortion rates. In Norway, subsequent to 1967, all deliveries, including late abortions after 16 wk of… (More)


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