Natural selection associated with birth weight. IV. U.S.A. data from 1950 to 1976.
D001724:Birth Weight; D005006:Ethnicity; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D012641:Selection, Genetic; D012737:Sex Factors; D014481:United States