Effect of Mass Shootings on Gun Sales – A 20 Year Perspective
Callcut, Rachael A., MD, MSPH1,2; Robles, Anamaria M., MD1,2; Kornblith, Lucy Z., MD1,2; Plevin, Rebecca E., MD1,2; Mell, Matthew W., MD, MS3

Journal of Trauma and Acute Care Surgery: May 31, 2019 - Volume Publish Ahead of Print - Issue - p
doi: 10.1097/TA.0000000000002399
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INTRODUCTION Granular data on gun sales has been historically difficult to obtain. In 2016, California (CA) made monthly data from 1996-2015 publically available. Control charts are a method to analyze how a process changes over time in response to non-routine events. We utilized this technique to study the impact of US mass shootings on CA gun sales.

METHODS Monthly gun sales were provided by the CA Department of Justice and monthly fatalities from the CDC Wonder Death Certificate Registry. Mass shooting events were obtained from after-action reports, news media, and court proceedings. Time ordered data were analyzed with control charts with 95% CIs (UCL, LCL) using QiMacros.

RESULTS 9,917,811 individual gun sales occurred in CA with a median monthly rate of 41,324 (range 20,057 – 132,903). A median 263 people lost their lives monthly from firearms (124 homicide, 128 suicide), totaling 53,975 fatalities from 1999-2015. 15/21 current deadliest mass shootings occurred during this study period with 40% from 2012-2015. Also, 36 school shootings occurred during the study (mean 5 deaths, range 0-33; 6 injuries, range 0-23) with 31% in 2012-2015 at rate of 3 events/year vs. 1.4 events/year in the 17 prior years (p<0.05). Sales were generally consistent from 1996-2011 (except post Columbine, Col). Starting in 2011, sales exceeded the 95% predicted UCL every single month. Before October 2011, there was no statistically significant sustained effect of mass shootings on sales (except Col); however, since a statistically significant proportional spike in sales occurred in the months immediately following every single deadliest mass-shooting event. Every year since 2012, CA has strengthened gun laws in response to mass shootings yet sales have risen immediately preceding enactment of these laws each January.

CONCLUSION Gun sales are more frequent since 2012, with an additional increase following both mass shootings and legislative changes enacted in response to these shootings.

Level of Evidence Epidemiology, Level III

© 2019 Lippincott Williams & Wilkins, Inc.