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BECAUSE of the recognized uncertainty of duration of gestation the objective measure of weight at birth has been widely used as an indicator of maturity of an infant at delivery. Yet, there is no question that, for any specific weight, the probability of survival will be closely related to the duration of pregnancy.1'2 Moreover, infant mortality among nonwhites at low birth weight has been widely noted to be less than that among whites, whereas at weights above 2,500 grams the rate among whites is lower. This reversal in relative mortality by weight at birth has led to the hypothesis that nonwhite infants at lower weights are more mature than white infants. In addition to other observations, we shall look into this hypothesis, at least insofar as maturity is measured by duration of gestation.

Influence of Weight and Gestation on Perinatal and Neonatal Mortality by Ethnic Group