There’s a new paper out by Marissa Harrison (of Penn State) et. al. collected historical data on the crimes of 112 murderers who killed 3 or more people with at least one week between each murder (killing more quickly did not disqualify one so long as there were at least 3 periods of single/multiple murder that were separated from all other periods of single/multiple murder by a full week on each side). 55 of the killers were women. This is the all but 9 of the women serial killers in the US from 1821 to 2008 – at least that they could find. From the men serial killers during that period they selected “matches” of the women subjects. “Matches” here means that they were approximately equivalent to their women counterparts on certain variable which the researchers wanted to control.
Then they ran some criminological statistics on the gender-separated populations & looked for differences. The resulting research was published in the Journal of Forensic Psychiatry & Psychology. NewAtlas, reporting on the study, tells us that: