Trends in teenage childbearing. United States 1970-81.
D000293:Adolescent; D000328:Adult; D001034:Apgar Score; D001723:Birth Rate; D004522:Educational Status; D005006:Ethnicity; D005260:Female; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D008393:Marriage; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D011295:Prenatal Care; D013223:Statistics as Topic; D014481:United States