Intellectual Disability

Definition:

Intellectual disability (ID) is a developmental condition characterized by significantly below-average intellectual functioning and deficits in adaptive behaviors that emerge before age 18.

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Common Types:

• Mild intellectual disability
  
• Moderate intellectual disability
  
• Severe/profound intellectual disability

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Source:

Schalock, R. L., et al. "The Definition and Classification of Intellectual Disability," American Association on Intellectual and Developmental Disabilities, 2010.