Sex ratio in 11,500 infants died at different perinatal periods (antenatal, intranatal and postnatal) is studied. Sex ratio in these periods is: 107 male : 100 female; 136 male : 100 female; 168 male : 100 female respectively; differences at each period are statistically significant (alpha less than 0.001). A change in differential sex-linked mortality is observed at perinatal period. High mortality in males, which is characteristic of human postnatal ontogenesis, manifests distinctly from the moment of passing on to extrauterine life.
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