Page 67 of DSM-IV, Fourth Edition, Section 299.00 Autistic Disorder ……states the following: “In most cases there is an associated diagnosis of mental retardation, commonly in the moderate range (IQ 35-50). Approximately 75{2879bc8f2cf0c7badc0ba0b91bc88170008fa0b1cee68ceb4afb7fd46d4bfeb9} of children …