Abstract
National data for this article, as in previous reports,1 are drawn principally from the Monthly Vital Statistics Report,2,3 published by the National Center for Health Statistics. The international data come chiefly from the United Nations Demographic Yearbook4 and the quarterly, Population and Vital Statistics,5 both published by the Statistical Office of the United Nations. These are official government reports, but the provisional data sometimes omit significant factors related to the World Health Organization definition of a live birth and an infant death. In such instances, data from World Health Organization Reports6 or direct communications from ministries of health7 have been substituted.

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