In 74 cases out of a total of 151 reported mass shootings in the United States since 1982, the shooter(s) displayed prior signs of mental health problems. In 17 cases out of 150, there were no signs of mental health issues in the shooters.
Mass shootings in the United States between 1982 and September 2024, by presence of prior signs of shooter's mental health issues
Since 2013, the source defines a mass shooting as any single attack in a public place with three or more fatalities, in line with the definition by the FBI. Before 2013, a mass shooting was defined as any single attack in a public place with four or more fatalities.
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Mother Jones. (September 4, 2024). Mass shootings in the United States between 1982 and September 2024, by presence of prior signs of shooter's mental health issues [Graph]. In Statista. Retrieved November 21, 2024, from https://www.statista.com/statistics/811557/us-mass-shootings-by-prior-signs-of-shooter-s-mental-health-issues/
Mother Jones. "Mass shootings in the United States between 1982 and September 2024, by presence of prior signs of shooter's mental health issues." Chart. September 4, 2024. Statista. Accessed November 21, 2024. https://www.statista.com/statistics/811557/us-mass-shootings-by-prior-signs-of-shooter-s-mental-health-issues/
Mother Jones. (2024). Mass shootings in the United States between 1982 and September 2024, by presence of prior signs of shooter's mental health issues. Statista. Statista Inc.. Accessed: November 21, 2024. https://www.statista.com/statistics/811557/us-mass-shootings-by-prior-signs-of-shooter-s-mental-health-issues/
Mother Jones. "Mass Shootings in The United States between 1982 and September 2024, by Presence of Prior Signs of Shooter's Mental Health Issues." Statista, Statista Inc., 4 Sep 2024, https://www.statista.com/statistics/811557/us-mass-shootings-by-prior-signs-of-shooter-s-mental-health-issues/
Mother Jones, Mass shootings in the United States between 1982 and September 2024, by presence of prior signs of shooter's mental health issues Statista, https://www.statista.com/statistics/811557/us-mass-shootings-by-prior-signs-of-shooter-s-mental-health-issues/ (last visited November 21, 2024)
Mass shootings in the United States between 1982 and September 2024, by presence of prior signs of shooter's mental health issues [Graph], Mother Jones, September 4, 2024. [Online]. Available: https://www.statista.com/statistics/811557/us-mass-shootings-by-prior-signs-of-shooter-s-mental-health-issues/
