Race and Pregnancy Outcomes in the Twentieth Century: A Long-Term Comparison
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Differentials between blacks and whites in birth weights and prematurity and stillbirth rates have been persistent over the entire twentieth century. Differences in prematurity rates explain a large proportion of the black-white gap in birth weights both among babies attended by Johns Hopkins
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美国国家经济研究局创建时间：
2003-03-01
