The purpose of the present paper was to test the validity of developmental quotients (DQ) on the Mental Development Scale for Infants and Young Children (MDSIYC) as an estimate of intelligence quotient (IQ). Correlations were carried out of its DQ with an IQ on the Japanese version of the Stanford-Binet in 94 children with Diagnostic and Statistical Manual of Mental Disorders (4th edn; DSM-IV) autistic disorder. With IQ, DQ in the five MDSIYC areas (motor, play, socialization, self-help, and speech) and full-scale DQ (mean of five-area DQ) had significant correlations (Pearson r) of 0.46, 0.56, 0.53, 0.46, 0.85, and 0.68, respectively, suggesting that speech DQ is the most valid estimate of IQ.
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Kurita et al. (2003) studied this question.
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