That means 1 in every 15 people have been at the scene of a mass shooting, defined as a singular event in which four or more people are shot. More than half of those who identified themselves as having been present for a mass shooting reported the incident occurred in the last decade. Gen Z — adults born after 1996 — are the most likely to have witnessed or been injured in a mass shooting. “Our findings lend credence to the idea of a ‘mass shooting generation,’” said the study’s senior author, David Pyrooz, a professor of sociology and criminologist in the Institute for Behavioral Science at CU Boulder. They are a relatively small percentage of U.S. gun deaths, which also includes suicide (58% of all gun deaths), murder (38%) and accidental shootings (including the the 3% of “other” gun deaths alongside individuals shot and killed by law enforcement).