Relation of Language-Delayed Preschoolers' Leiter Scores to Later IQ

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Abstract
I investigated the predictive utility of the Arthur adaptation of the Leiter International Performance Scale for language-impaired and/or behaviorally disturbed preschool children. The participants, drawn from a hospital child development unit, were selected because they had at least a 16-point difference between Leiter and Stanford-Binet Scale of Intelligence scores. Twenty-six children with a mean age of 48 months, a mean Leiter score of 102.96, and a mean Stanford-Binet score of 67.69 were retested an average of 16 months later with the Wechsler Preschool and Primary Scale of Intelligence (WPPSI). Both initial measures correlated significantly with the WPPSI Full Scale IQ (M = 87.46). Not unexpectedly, the Stanford-Binet scores were lower than the later IQ scores, whereas the Leiter scores were higher.

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