Teenage pregnancy and birth rates--United States, 1990.
D000029:Abortion, Legal / Q000706:statistics & numerical data / Q000639:trends; D000293:Adolescent; D001723:Birth Rate / Q000639:trends; D005260:Female; D006801:Humans; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology