Mental retardation has different levels. There is Mild intellectual disability; moderate intellectual disability; severe intellectual disability; and Profound intellectual disability.

https://www.floridahospital.com/mental-retardation-mr/symptoms-and-signs-mental-retardation

International Sports Federation for Persons with Intellectual Disability was created in 1986.

integration and sexual education in people with intellectual disability

Intellectual disability.

Intellectual Disability...............