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Objective: The purpose of this study was to examine the clinical validities and efficiencies of the Child Behavior Checklist (CBCL) and the ADHD Rating Scale-IV (ARS) in identifying children with attention-deficit hyperactivity disorder (ADHD) in Korean community-based samples.Method: A large sample of elementary school students (n = 1668) participated in this study. We used the CBCL and the ARS as the screening instruments. Diagnoses were determined by clinical psychiatric interviews and confirmed by DSM-IV-based structured interviews.Results: Of the 46 subjects who underwent clinical psychiatric interviews, 33 were diagnosed as having ADHD. A T score of 60 with regard to the Attention Problems profile of the CBCL resulted in a reasonable level of sensitivity or positive predictive value in the diagnosis of ADHD. In both the parent and teacher reports of the ARS, 90th percentile cut-off points resulted in a high level of predictive value. The highest levels of specificity and positive predictive value were obtained when we combined the CBCL (T > or = 60 in Attention Problems) and the ARS (parent-teacher total > or = 90th percentile) reports.Conclusions: These findings suggest that the combined use of the CBCL and the ARS could serve as a rapid and useful clinical method of predicting or even diagnosing children with ADHD in epidemiologic case definitions. [ABSTRACT FROM AUTHOR]