Sexual activity, contraceptive use and pregnancy among metropolitan-area teenagers: 1971-1979.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D003075:Coitus; D003267:Contraception / Q000379:methods / Q000639:trends*; D005260:Female; D006801:Humans; D008297:Male; D008393:Marriage; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D012725:Sexual Behavior; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014505:Urban Population; D044465:White People