Differences in WISC-R Full Scale mean IQs by age for 931 lower-class English-speaking Southern children were reported. Black children and white children tended to have similar mean IQs at Age 6 (t = —0.55). By Age 9 the differences in mean IQ became distinct and increased with age. The mean IQ of the black children declined after Age 8 while the mean IQ of the white children remained about the same or increased after Age 8.
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