Korean Journal of Pediatrics 2004;47(5):496-504.
Published online May 15, 2004.
The Relationship between Developmental Quotient in Children with Delayed Language Development and Later Intellectual Quotient
So Yeon Kim1, Yeon Kyung Jung1, Hai Lee Jung1, Woo Taek Kim1, Im Hee Shin2, Jung Han Park3, Heng Mi Kim6, Jin Kyung Kim1
1Department of Pediatrics, College of Medicine, The Catholic University of Korea, Daegu, Korea
2Department of Biostatistics, College of Medicine, The Catholic University of Korea, Daegu, Korea
3Department of Preventive Medicine, College of Medicine, The Catholic University of Korea, Daegu, Korea
6Department of Pediatrics, College of Medicine, Kyungpook University , Daegu, Korea
언어 발달 지연아의 발달지수와 후기 지능과의 관련성
김소연1, 정연경1, 정혜리1, 김우택1, 신임회2, 박정한3, 김행미6, 김진경1
1대구가톨릭대학교 의과대학 소아과학교실
2대구가톨릭대학교 의과대학 의학통계학교실
3대구가톨릭대학교 의과대학 예방의학교실
6경북대학교 의과대학 소아과학교실
Jin Kyung Kim, Email: kimjk@cu.ac.kr
: 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.
: 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).
: According to CAT DQ(Cognitive Adaptive Test Developmental Quotient), 66 children were divided into 4 groups: group I(CAT DQ<50), group II(50-69), group III(70-84), and group IV(≥85). There was a moderate correlation between CAT DQ and later total IQ in group I(r=0.58) and II(r= 0.50), but a low correlation in group III(r=0.19) and IV(r=-0.16). IQs in follow-up tests of all children in group I and II 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.
: 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.
Key Words: Language delay, Developmental quotient, Intelligence quotient

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