Intellectual Disability

Intellectual Disability: Intellectual disability1 involves problems with general mental abilities that affect functioning in two areas:

  • Intellectual functioning (such as learning, problem solving, judgement).
  • Adaptive functioning (activities of daily life such as communication and independent living).

Additionally, the intellectual and adaptive deficit begin early in the developmental period.

Intellectual disability affects about 1% of the population, and of those about 85% have mild intellectual disability. Males are more likely than females to be diagnosed with intellectual disability.