Mass Casualty Shooting Venues, Types of Firearms, and Age of Perpetrators in the United States, 1982-2018.

Abstract

To evaluate the association between mass casualty shooting venues, types of firearms, and the age of perpetrators in the United States. We analyzed data on mass casualty (≥ 3 fatalities) shootings for August 1982 through February 14, 2018. We describe data overall, specifically by school venues and the weapons used. We categorized perpetrators by ages of younger than 18 years, 18 to 20 years, and 21 years and older. We described the number of victims (fatalities plus injuries) by medians and average per event. Of 97 events, the median perpetrator age was 35 years and 21 years for school shootings. Four of 16 school events were committed by those aged 18 to 20 years, and all of those events included long guns. Victims of perpetrators aged 18 to 20 years made up 9.0% of all victims and 31.1% of victims of school shootings. Persons aged 18 to 20 years perpetrated about 1 in 8 shootings, accounting for about 1 in 3 victims of school shootings. Public Health Implications. Legislation to prevent mass casualty events must be multifaceted, including age restrictions, restrictions on certain types of firearms, and improved resources for mental health, with particular emphasis on mental health and firearm restrictions for young adults.