NOTE: All gangs, whether or not they are involved in violent or illegal activity, are included. "At school" includes the school building, on school property, on a school bus, or going to and from school. In 2005, the unit response rate for this survey did not meet NCES statistical standards; therefore, interpret the data with caution. For more information, please see appendix A. Population sizes for students ages 12–18 are 24,315,000 in 2001; 25,684,000 in 2003; and 25,811,000 in 2005.
SOURCE: U.S. Department of Justice, Bureau of Justice Statistics, School Crime Supplement (SCS) to the National Crime Victimization Survey, various years, 2001–2005.