School-age mothers: 1968 and 1979.
D000293:Adolescent; D000328:Adult; D005193:Family Planning Services; D005260:Female; D006801:Humans; D009035:Mothers; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D012959:Socioeconomic Factors; D013334:Students; D014481:United States