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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: http://www.cloudnet.com/~edrbsass/mrcharacteristics.htm

Severe Mental Retardation
APA Reference
Fournier, G. (2016). Severe Mental Retardation. Psych Central. Retrieved on July 13, 2018, from https://psychcentral.com/encyclopedia/severe-mental-retardation/