Selected behaviors that increase risk for HIV infection, other sexually transmitted diseases, and unintended pregnancy among high school students--United States, 1991.
D000293:Adolescent; D000294:Adolescent Behavior; D000367:Age Factors; D005260:Female; D015658:HIV Infections / Q000453:epidemiology*; D006801:Humans; D008297:Male; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data*; D012309:Risk-Taking; D012725:Sexual Behavior; D012749:Sexually Transmitted Diseases / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology