No agreement has been reached yet on the co-occurrence of Intellectual Disability (ID) and Autism Spectrum Disorders (ASD) in young children. This study describes the clinical profiles of 253 children with ASD between 30 and 65 months old, on IQ and adaptive behaviors, prior to their entry in an early behavioral intervention program. Results showed that 36.8 % of the children met the criteria for ID, with 60.2 % of these in the mild range (IQ 50–69) and 39.8 % in the moderate range (IQ 35–49). ID profiles were similar for boys and girls. Intellectual and adaptive behavior profiles are described as well as their links to various socioeconomic factors.
