Prevalence

Almost 30% of youth in the United States (or over 5.7 million) are estimated to be involved in bullying as either a bully, a target of bullying, or both. In a recent national survey of students in grades 6-10, 13% reported bullying others, 11% reported being the target of bullies, and another 6% said that they bullied others and were bullied themselves.

From:http://www.safeyouth.org/scripts/faq/bullying.asp