RT Book, Section A1 Schaaf, Christian P. A2 Kline, Mark W. SR Print(0) ID 1182930954 T1 Genetic Evaluation of Intellectual Disability and Autism T2 Rudolph's Pediatrics, 23e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259588594 LK accesspediatrics.mhmedical.com/content.aspx?aid=1182930954 RD 2024/04/23 AB The American Association of Intellectual and Developmental Disabilities defines intellectual disability as “a disability characterized by significant limitations in both intellectual functioning and in adaptive behavior, which covers many everyday social and practical skills.” Intellectual disability originates before the age of 18.