Short Description or Definition
The definition of intellectual disability (ID) is based on three criteria: significant limitations in both intellectual functioning and in adaptive behavior as expressed in conceptual, social, and practical adaptive skills and age of onset before age 18 years (Schalock, Verdugo, Bonham, Fantova, & Van Loon, 2010). It is estimated that the occurrence of ID in ASD ranges from 25% to 70%, depending on a number of methodological factors, including the design of the studies, the definitions of ASD and ID, and the ascertainment methods used (LaMalfa, Lassi, Bertelli, Salvini, & Placidi, 2004; Lecavalier, Snow, & Norris, 2011; Matson & Shoemaker, 2009). ASD is the second most common co-occurring mental disorder in individuals with ID after attention-deficit/hyperactive disorder (AD/HD) (Centers for Disease Control, 2010)....
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Nevill, R.E.A., Havercamp, S.M. (2013). Intellectual Disability. In: Volkmar, F.R. (eds) Encyclopedia of Autism Spectrum Disorders. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1698-3_1641
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