The 2009 Handbook of Crime Correlates stated that reviews have found that around eight IQ points, or 0.5 SD, separate criminals from the general population, especially for persistent serious offenders.
I Bogen Handbook of Crime Correlates fra 2009 nævnes det at undersøgelser har fundet, at omkring otte IQ points, separerer kriminelle fra den almindelige befolkning, især for vedvarende alvorlige lovovertrædelser.