African–White IQ differences from Zimbabwe on the Wechsler Intelligence Scale for Children-Revised are mainly on the g factor

African–White differences on the sub-tests of the Wechsler Intelligence Scale for Children-Revised (WISC-R) in Zimbabwe are like the Black–White differences in the US in being positively associated with the sub-testsʹ g loadings (g being the general factor of intelligence). Published means and S.D.s for 204 12- to 14-year-old Zimbabweans on 10 WISC-R sub-tests were compared against those for 1868 White Americans. A principal factor analysis of the correlation matrix from the US standardization sample for Whites, along with the point-biserial correlation of African–White standardized differences, showed that fully 77% of the between-group race variance was attributable to a single source, namely g.