The sex ratio at birth.
Rubin
E
E
D001741:Black or African American; D000569:Americas; D003469:Culture; D003710:Demography; D019049:Developed Countries; D005006:Ethnicity; D008423:Maternal Age; D009656:North America; D011153:Population; D011154:Population Characteristics; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012098:Reproduction; D017678:Sex Distribution; D012737:Sex Factors; D012744:Sex Ratio; D014481:United States; D044465:White People
Americas; Blacks; Cultural Background; Demographic Factors; Developed Countries; Ethnic Groups; Maternal Age; North America; Northern America; Population; Population Characteristics; Pregnancy; Pregnancy, Multiple; Reproduction; Sex Distribution; Sex Factors; Sex Ratio; United States; Whites