The most recent epidemiological data suggests that approximately 32% of children with ASD have co-occurring ID (IQ ≤ 70), 24% fall within the borderline range (IQ = 71–85) and 44% fall within the average range (IQ > 85; Christensen et al., 2016).  This was another study in the article I read. 

 ASD sample contains a larger proportion of individuals with severe and profound ID than seen in larger population-based epidemiological studies of ASD.

Bridgewater College

* Individuals with ASD were the most impaired. 
* The NCI Adult Consumer Survey population represents: 
      adults receiving services from state developmental disability systems 
      and a diagnosis of ASD alone is not always sufficient to receive state 
       funded DD services. 
* The subset of individuals in this dataset with ASD may represent 
        * a population of individuals with comorbid diagnoses 
        * More complex service needs
         * Beyond that of an individual with only an ASD diagnosis.

NCI Adult Consumer Survey population represents adults receiving services from state developmental disability systems and a diagnosis of ASD:


Bush, K. L., & Tassé, M. J. (2017). Employment and choice-making for adults with intellectual disability, autism, and down syndrome. Research in Developmental Disabilities, 65, 23–34. https://doi.org/10.1016/j.ridd.2017.04.004

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