title: Secular trends in self-reported violent activity among Ontario students, 1983-2001.
abstract: BACKGROUND
  This paper examines secular trends in violence among Ontario students between 1983 and 2001, and variation by sex.
  
  
  METHODS
  Using data from the Ontario Student Drug Use Survey, we examined self-reports of assault, weapon carrying, and gang fighting based on 10 cross-sectional surveys from 1983 to 2001. Respondents were derived from representative samples of Ontario students in grades 7, 9, 11, and 13 (OAC) who completed in-class anonymous self-administered surveys. Data were weighted to account for the complex survey design and analyzed using logit trend analyses.
  
  
  RESULTS
  Short-term trends (1991-2001) showed assault, weapon carrying, and gang fighting have been on downward trajectories since the mid-1990s, reaching the lowest prevalence in 2001 among males and females. Long-term trends (1983-2001) among 11th-graders showed assault increased between 1985 and 1999, but declined in 2001. Gang fighting among males increased during the late 1980s and again during the mid-1990s, but declined between 1997 and 2001. Gang fighting among females remained at a stable, low level.
  
  
  CONCLUSIONS
  Future monitoring is necessary to understand whether the decline in self-reported violent behaviour among adolescents is robust.
authors.affiliation: Centre for Addiction and Mental Health, Population and Life Course Studies, Toronto, ON. angela_paglia@camh.net
authors.forename: Angela
authors.initials: A
authors.lastname: Paglia
authors.forename: Edward M
authors.initials: EM
authors.lastname: Adlaf
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D009864:Ontario / Q000453:epidemiology; D012650:Self Disclosure; D013334:Students; D014754:Violence / Q000706:statistics & numerical data / Q000639:trends*