Results from the survey are scheduled to be available from the National Child Traumatic Stress Network.
A recent survey of 28,000 Los Angeles 6th graders found that between 70 percent and 90 percent had experienced or witnessed violence in their communities.
The survey, conducted by the National Child Traumatic Stress Network, a group of 54 treatment centers, focuses on violence outside the home and concludes that children who were witnesses or victims of weapons violence or physical assaults had higher rates of school expulsion and lower attendance rates.