Study casts doubt on abstinence-only programs.
D000293:Adolescent; D017280:Condoms / Q000706:statistics & numerical data*; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D015397:Program Evaluation / Q000706:statistics & numerical data; D012736:Sex Education; D012746:Sexual Abstinence / Q000706:statistics & numerical data*; D014481:United States