0.17 Drexel A. Peterson_ Jr., The Effects of Sickle-Cell Disease on Black IQ and Educational Accomplishment: Support for Montagu and "Sociogenic Brain Damage", American Anthropologist, 1974.

{ data sample variables societies }	0.19
{ number data group table }	0.18
{ human genetic populations modern }	0.17
{ behavior social children personality }	0.16