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- ArticleBerry LG.Demography. 1977 Aug;14(3):297-310.Comparisons of crude and standardized rates of maternal mortality show that changes in age and parity distributions of births had some influence on maternal mortality trends for the years 1919-1969 in the United States. Changes in the age and parity distributions of births for cohorts of U.S. women also influenced crude cohort maternal mortality rates to some extent.