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Data for this article, as in previous reports,1 are drawn principally from the Monthly Vital Statistics Report,2-5 published by the National Center for Health Statistics. The international data come from the Demographic Yearbook6 and the quarterly Population and Vital Statistics Report,7 both published by the Statistical Office of the United Nations, and the World Health Statistics Report,8 published by the World Health Organization. All the United States data for 1976 are estimates by place of occurrence based upon a 10% sample of material received in state offices between two dates, one month apart, regardless of when the event occurred. Experience has shown that for the country as a whole the estimate is very close to the subsequent final figures.
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