Abstract
A sample of 240 preschool children was used to assess the con struct validity of each of the McCarthy Scales of Children's Abilities (MSCA). Individual subtests were used in a stepwise regression analysis of MSCA scales. This analysis supported McCarthy's con struct of the General Cognitive Index (GCI) as well as the Verbal and Perceptual-Performance Scales. Construct of the Quantitative Scale was vague. For this sample, neither the Memory or Motor Scale construct was documented. This study indicated that clinical interpretation of the GCI may be warranted, but diagnostic use of the Memory or Motor Scales with preschool children should be avoided.
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