Comparison of Infant Mortality among Twins and Singletons: United States 1960 and 1983

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Abstract
Infant mortality among US black and white twins and singletons was compared for 1960 and 1983 usIng the Linked Birth/Infant Death Data Sets from the National Center for Health Statistics. Both twin and singleton infant mortality rates showed impressive declines since 1960 but almost all of the improvement in survival for both twins and singletons was related to increased birth weight-specific survival rather than improved birth weight distribution. One-half of white twins and two-thirds of black twins weighed less than 2500 g at birth, and 9% of white twin births and 16% of black twin births were in the very low (Am J Epidemiol 1991 ;133:133-43.