A study on Reliability and Validity of KQ-CHAT-10 for Korean Infants and Toddlers with ASD

This study examined reliability and validity of the Quantitative Checklist for Autism in Toddlers 10 (Q-CHAT-10) to verify its effectiveness for Korean children. Subjects included 50 children with ASD and 81 typical children. Instruments were the Korean version of the Q-CHAT-10 (KQ-CHAT-10), CBCL 1.5-5 and CARS. The KQ-CHAT-10 showed a significant inter-item correlation except the item number 10 and its reliability was verified by inter-item consistency and test-retest reliability. Exploratory factor analysis showed all items excluding the number 10 were loaded onto one factor. Also, concurrent validity was checked between the KQ-CHAT-10, CBCL'S Pervasive Developmental Problems DSM-Oriented Scales, and CARS. In the 2-point KQ-CHAT-10, the statistical cut-off value of 3 demonstrated the highest sensitivity and specificity. This study is of significance in that it is the first study to check the reliability and validity of Q-CHAT-10 with Korean children.