Inbreeding depression and IQ in a study of 72 countries Vrije Universiteit Brussel
In this ecological study, a robust negative correlation of r = - .62 (P < .01) is reported between national IQs and consanguinity as measured by the log10 transformed percentage of consanguineous marriages for 72 countries. This correlation is reduced in magnitude, when IQ is controlled for GDP per capita (r = - .41, P < .01); education index (r = - .40, P < .01); and democracy index (r = - .42, P < .01). Multiple regression ...