The Relationship between Developmental Quotient in Children with Delayed Language Development and Later Intellectual Quotient

Purpose:The objective of this study was to test the predictive validity of developmental test for later intellectual development in young children with delayed language development. Methods:The study subjects were 66 children who had presented delayed language development and had an initial developmental test and a follow-up intelligence test. The mean age at initial test was 34.2 months(17-48 months), and the mean age at the follow-up test was 55.0 months(40-79.5 months). Results:According to CAT DQ(Cognitive Adaptive Test Developmental Quotient), 66 children were divided into 4 groups: group I(CAT DQ