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Severe Mental Retardation

An IQ score between 20-25 and 40.

Example: Behavioral observations of a twelve-year-old child indicate that his capacity for adaptive learning is at the average level for four-year-olds.

Her is a list of caegories that show general guidelines for judging the level of retardation including mild, moderate-severe, and severe:

Severe Mental Retardation
APA Reference
Fournier, G. (2018). Severe Mental Retardation. Psych Central. Retrieved on July 8, 2020, from