Sexually active teens.
D000293:Adolescent; D005260:Female; D015528:HIV Seroprevalence / Q000639:trends*; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D007231:Infant, Newborn; D007484:Iowa; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data*; D012736:Sex Education / Q000639:trends