100 Cree and Ojibwa children, ages 6–15, were administered the WISC. The mean Performance IQ (PIQ) was in the normal range at all ages; the verbal IQ (VIQ) was in the mentally deficient or dull-normal range. The PIQ-VIQ difference diminished with age. Familiarity with the English language increased VIQs but had little effect on PIQs. A significant correlation between IQs and school grades was found only for 9–10-year-olds. A comparison of Indian IQ norms with original WISC normative data is given.
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John et al. (1976) studied this question.
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