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Subject: pure internalizing, pure externalizing groups psychol. Using composite scores from teacher ratings on the Child Behavior Checklist (CBCL; Achenbach & Edelbrock, 1986) administered in grades 1, 2, and 3, children were placed in pure internalizing, pure externalizing, and mixed internalizing-externalizing groups; 78% of the internalizers, 69% of the externalizers, and 63% of the mixed group received K-SADS diagnoses in adolescence.
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