
Figure 4.1. |
Percentage of students in grades 9–12 who reported being threatened or injured with a weapon on school property at least one time during the previous 12 months, by grade: Various years, 1993–2009 |
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NOTE: "On school property" was not defined for survey respondents. SOURCE: Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Youth Risk Behavior Surveillance System (YRBSS), various years, 1993–2009. |