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KMID : 0367420040470050496
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Journal of Korean Pediatric Society
2004 Volume.47 No. 5 p.496 ~ p.503
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The Relationship between Developmental Quotient in Children with Delayed Language Development and Later Intellectual Quotient
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Shin Im-Hee
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Abstract
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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<50), group 11(50-69), gro ip 111(70-84), and group IV(2t85). There was a moderate correlation between CAT DQ and later tot. d IQ in group I(r=0.58) and II(r= 0.50), but a low correlation in group I I(r=-0.19) and Mr=-0.16). IQs in follow-up tests of all children in group I and 11 were lower than 70, except two children whose IQs were 75 and 78. IQs of children in group III were lower than 85 except for three children whose IQs were 89, 89, and 90, respectively.
Conclusion : The findings of this study suggest that if DQ is lower than 70, the child is highly probable to be mentally subnormal in later years. Although the correlation between CAT DQ and later total IQ is low in children with DQs over 70, if a DQ is between 70 and 84, the child is very likely to have learning disability in later years.
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KEYWORD
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Language delay, Developmental quotient, Intelligence quotient
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