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Table 1 Characteristics of High School Students Who Had Sexual Intercourse, National YRBS 2005–2011

From: HIV testing among United States high school students at the state and national level, Youth Risk Behavior Survey 2005–2011

Characteristic Students, % (95% CI) (n = 28177)
Sex of the subject  
  Male 52.1 (51.3–52.9)
  Female 47.9 (47.1–48.7)
Grade of the subject  
  9th grade 19.8 (18.9–20.6)
  10th grade 23.7 (23.0–24.4)
  11th grade 26.8 (26.1–27.5)
  12th grade 29.7 (28.9–30.6)
Race and ethnicity  
  White 55.6 (52.4–58.8)
  Black or African American 18.7 (16.6–21.1)
  Hispanic 18.7 (16.8–20.7)
  Other 6.9 (5.9–8.1)
Ever been tested for HIV  
  Yes 21.9 (21.0–22.8)
  No, not sure 78.1 (77.2–79.0)
Use of condom at last sexual intercourse  
  No 35.4 (34.3–36.4)
  Yes 64.6 (63.6–65.7)
4 or more sexual partners in life  
  Yes 31.1 (30.1–32.0)
  No 68.9 (68.0–69.9)
First sexual intercourse before 13  
  Yes 13.5 (12.8–14.2)
  No 86.5 (85.8–87.2)
Ever forced to have sexual intercourse  
  Yes 14.1 (13.4–14.8)
  No 85.9 (85.2–86.6)
Lifetime illegal injection drug use  
  Yes 3.5 (3.2–3.9)
  No 96.5 (96.1–96.8)
  1. Abbreviations: HIV human immunodeficiency virus.