Prevalence rate of severely retarded children in Tokyo

Prevalence rate of severely retarded children aged 6-14 years was studied in Tokyo. The definition of severely retarded children was those who neither walk nor have their IQs over 35. We visited total of 60 institutions and schools for retarded children in and around Tokyo. Because of the school system in Tokyo that enrolls all children regardless of their disabilities, case finding was exhaustive. The number of severely retarded identified was 830. The prevalence rate was 0.68/1,000 on April 1, 1988. We conclude that the prevalence rate of severe retardation is modestly lower than the rates previously reported from other areas of Japan.