Sudden Infant Death Trends in Six Metropolitan Communities, 1965-1974

Abstract
Data from 6 geographically dispersed metropolitan areas in the USA in which special sudden infant death syndrome (SIDS) surveillance programs for detection and autopsy diagnosis existed during the period 1965 through 1974 reveal considerably diversity in overall 10 yr incidence rates as well as in annual rate distribution patterns. A downward trend in SIDS incidence occurred in some areas but not in others. Non-SIDS postneonatal death rates, which were used for comparison, also decreased in some areas. Rate trends for whites and nonwhites were not consistent. During the same period, the fertility rate in the United States decreased by about 1/3 for both whites and nonwhites. Concomitants of the fertility rate decline may have reduced the number of high mortality risk babies to a variable degree in different places and at different times.

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