Sexual activity* and condom use** among high school students, by grade, 2003 (stacked vertical bar chart): 9th grade: Sexually active, 21.2%; Condom use, 14.6%. 10th grade: Sexually active, 30.6%; Condom use, 21.1%. 11th grade: Sexually active, 41.1%; Condom use, 25.0%. 12th grade: Sexually active, 48.9%; Condom use, 28.1%.
*Percent of students who had sexual intercourse during the 3 months prior to the survey. **Percent of students who are sexually active and used a condom at last sexual intercourse.

Source: Centers for Disease Control and Prevention (21 May, 2004). MMWR, Vol. 53, No. SS-2: Youth Risk Behavior Surveillance — United States, 2003. Atlanta, GA: U.S. Department of Health and Human Services.