title: [Differential fertility by intelligence.  The role of birth planning (Author's transl)].
authors.forename: J R
authors.initials: JR
authors.lastname: Udry
mesh_terms: D000569:Americas; D001723:Birth Rate; D003267:Contraception; D003469:Culture; D003625:Data Collection; D003710:Demography; D019049:Developed Countries; D005006:Ethnicity; D005193:Family Planning Services; D005298:Fertility; D009656:North America; D010298:Parity; D011153:Population; D011154:Population Characteristics; D011157:Population Dynamics; D012106:Research; D012494:Sampling Studies; D014481:United States; D044465:White People
keywords: Americas; Contraception; Cultural Background; Demographic Factors; Developed Countries; Ethnic Groups; Family Planning; Fertility; Fertility Measurements; North America; Northern America; Parity; Population; Population Characteristics; Population Dynamics; Research Methodology; Sampling Studies; Studies; Surveys; United States; Whites