Abstract
From 2019 to 2020, homicide showed its largest single-year increase in modern US history. While many have cited the COVID-19 pandemic or police killing of George Floyd as initiating the rise, there has been limited systematic investigation of how the timing of the increase corresponded with these key events. We investigated trends in firearm and non-firearm homicide across sociodemographic and geographic groups to clarify the timing and nature of the recent increase. We conducted a descriptive epidemiologic study using National Vital Statistics System weekly mortality data from January 2018 to December 2022, US. We seasonally adjusted and smoothed weekly firearm and non-firearm homicide data, quantifying changes in relation to key event dates for the COVID-19 pandemic, killing of George Floyd, and 2020 national election. We disaggregated trends by sociodemographic and geographic characteristics. Between January 2018 and December 2022, firearm homicide increased by 54% while non-firearm homicide was stable. The increase in firearm homicide started by October 2019 and stabilized by November 2020; 28% of the eventual increase had already occurred by the time COVID-19 was declared a national emergency. All sociodemographic and geographic groups experienced large recent increases in firearm homicide. The magnitude and timing of the recent increase in homicide has been previously understated and obscured by crude data and seasonal patterns. Existing theories, including the COVID-19 pandemic, fall short in explaining the historic surge, which is specific to firearm homicide, started in late 2019, and affected all persons and places across the US.
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