Objectives: We revised the Japanese version of the RAADS, and tested the reliability and validity of the scale.
Methods: The preliminary version of the RAADS-J was revised so that people can understand the meaning without confusing or difficulties, with through considerations on cultural perspectives of the Japanese social and colloquial expressions. It was distributed to a hundred individuals with ASD, who participated in the public event aiming for networking of adults with ASD in which one of the authors (MT) attended as an instructor. Thirty-four volunteers were also recruited as control. In addition, 31 out-patients with different psychiatric disorders (i.e., Schizophrenia, Depressive Disorders, and Anxiety Disorders) in the hospital affiliated to Hamamatsu University School of Medicine voluntarily participated in the study. All participants were asked for completion of the revised RAADS-J twice to check test-retest reliability as well as Autism-Spectrum Quotient Japanese version (AQ-J) to test the criterion-related validity.
Results: With the revised version of the RAADS-J, we successufully discriminate adults with ASD from non-ASD adults, as well as from adults with other psychiatric disorders.
Conclusions: Same as the original RAADS, the RAADS-J is also usuful as a clinical scale to assist idenfification of Autism and Asperger's Disorder in adults in Japan.