A Closer Look at the Rising Epidemic of Mass Shootings in the United States and Its Association With Gun Legislation, Laws, and Sales.

Introduction: Mass shootings pose a considerable threat to public safety and significantly cost the United States in terms of lives and expenses. The following are the specific aims of this study: (1) to assess US mass shootings, firearm-related sales, laws, and regional differences from 2015 to 2021 and (2) to investigate changes in mass shootings and firearm sales before and during the Coronavirus Disease 2019 pandemic.

Methods: A retrospective review was conducted of mass shootings, gun sales, and laws regarding the minimum age required to purchase a firearm within the United States from 2015 to 2021. The 10 states/regions with the greatest mean mass shootings/capita from 2015 to 2021 were selected for further analysis.

Results: Mass shootings correlated significantly with firearm sales from 2015 to 2021 nationwide (P < 0.02 for all). The growth in mass shootings, the number killed/injured, and gun sales were greater in 2020 and 2021 compared to the years prior. The 10 states with the highest mean mass shooting/capita over the study period were Alabama, Arkansas, the District of Columbia, Illinois, Louisiana, Maryland, Mississippi, Missouri, South Carolina, and Tennessee. No significant correlation was found between the number of mass shootings/capita and the minimum age to purchase a firearm.

Conclusions: Firearm sales correlated significantly with mass shootings from 2015 to 2021. Mass shootings and gun sales increased at greater rates during the Coronavirus Disease 2019 pandemic compared to the years before the pandemic. Mass shootings exhibited inconsistent trends with state gun laws regarding the minimum age to purchase a firearm. Future studies may consider investigating the methods by which firearms used in mass shootings are obtained to further identify targets for prevention.