d2‐R test for Japanese adolescents: Concurrent validity with the attention deficit‐hyperactivity disorder rating scale

Background The d2‐R test is a cancellation test developed in Germany to measure concentration and attention. This study examined the validity of the d2‐R test for Japanese adolescents in comparison with German standardized data. Methods Japanese junior high school students (n = 121; 61 girls, 60 boys) participated in this study. The students’ performance scores in the d2‐R test were compared with their daily attentiveness and hyperactivity/impulsiveness assessments conducted by the teachers. The assessments were evaluated using the attention deficit–hyperactivity disorder rating scale, fourth edition (ADHD‐RS)‐IV. The comparison with German counterparts was also made. Results Students who were rated as less attentive and more hyperactive/impulsive performed more slowly and committed more errors in the d2‐R test. Although there were no sex differences in any of the d2‐R parameters, male students were rated higher than female students in all of the ADHD‐RS‐IV scores. Japanese adolescents outscored German counterparts on speed, concentration, and carefulness. Conclusion The concurrent validity of the d2‐R test is confirmed. It is an appropriate index to measure the sustained and focused attention of Japanese adolescents. The present research merits attention as the first investigation of the d2‐R test conducted for Japanese adolescents.