title: Second pregnancies to premaritally pregnant teenagers, 1976 and 1971.
mesh_terms: D000293:Adolescent; D001721:Birth Intervals; D001722:Birth Order; D003268:Contraception Behavior; D005193:Family Planning Services / Q000639:trends*; D005260:Female; D006801:Humans; D008393:Marriage; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D014481:United States; D044465:White People / Q000523:psychology