- 96 percent of mass shooters were male.
- An average of 3.22 victims were killed and 3.83 wounded. (Note: Though the FBI doesn't classify someone as a mass murderer unless he kills at least four people in one location, Lankford classified a mass shooting as anything more than two people.)
- 32 percent of mass shootings happened at schools. Public, commercial locations (like restaurants or a mall) accounted for 23 percent of attacks.
- For every additional person the shooter killed, his own likelihood of dying was 1.2 times higher. The number of people wounded was not a statistically significant predictor.
- For every additional weapon the shooter carried, he was 1.73 times more likely to die. (Three were found on Alexis's body.)
- Shooters who attacked people at a factory/warehouse or at a commercial location were more likely to die than those who carried out an attack somewhere in the study's "other" category of locations, which was anything NOT classified as a factory/school/commercial space/office. Factory attackers were almost eight times more likely to die.