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Table 1 Summary of violent and weapon-related disciplinary incidents (2008–09 to 2011–12) in 2681 Minnesota schools

From: Ambient air pollution and the risk of violence in primary and secondary school settings: a cross-sectional study

Strata

Student cohortA

Student school yearsB

Violent incidentsC

Weapon-related incidentsC

Total

831,002

4,875,794

89,860 (1,842.98)

4525 (92.81)

Urban

609,570

3,579,306

71,554 (1999.10)

3410 (95.27)

Rural

241,417

1,296,488

18,306 (1,411.97)

1115 (86.00)

  1. A)Total number of unique students who had a disciplinary referral for a violent incident. Urban and rural student categories will not add up to the total student cohort because students may have switched school types during the study period
  2. B)A school year in Minnesota equals 165 instructional days and we included 4 academic years in this study
  3. C)Total number of incidents (incidence rate per 100,000 students per school year)
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Injury Epidemiology

ISSN: 2197-1714