This study compared the performance on the WAIS and WAIS—R of 21 mentally retarded adults residing in an Intermediate Care Facility. Tests were administered in one order, the WAIS initially and the WAIS—R second, with approximately two years between testings. Significant differences were found on the WAIS and WAIS—R for Verbal, Performance and Full Scale IQs. This finding contrasts with the differences between the measures as reported in the WAIS—R manual.
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