Psychopaths make up 4.5% of the adult population, according to a new meta-analysis

A meta-analysis conducted by researchers at Universidad Complutense de Madrid in Spain estimates the "prevalence rate of psychopathy in the general adult population at 4.5%."

The rate is higher in males and lower in females. It found that"psychopathy levels are higher in North American male and female prisoners than in European male and female prisoners." — Read the rest