Analysis of diagnostic questionnaires completed by Japanese parents of 141 autistic children below the age of 12 found that the Japanese peak of abnormal social behavior, including autistic symptoms as reported by parents, was from the ages of 3 to 9 years as compared with the U.S. and European peak of 3 to 6 years. (Author/DB)

A Japanese translation of the Childhood Autism Rating Scale was used with 167 developmentally disabled children under age 16. Total score demonstrated a satisfactory level of taxonomic validity and discriminated infantile autism and other pervasive developmental disorders from mental retardation alone. A satisfactory concurrent validity on the…