Abstract
The d2-R test, developed as a general achievement test in Germany, plays a prominent role in Europe to measure individuals' concentration and attention in both research and in practice. This study developed the d2-R test for Japanese children, and examined its concurrent validity using correlations between d2-R performance and ADHD-RS scores. The results revealed that the d2-R parameters were significantly related to the inattention and hyperactivity–impulsivity scores on the ADHD-RS. The d2-R saves both time and expense for clinical psychologists as well as researchers in Japan, and is appropriate for mass screenings for ADHD.
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