Mental retardation is generally characterized by significantly sub-average intellectual functioning (IQ of 70 or below), but different degrees of severity of mental retardation exist based on the level of intellectual impairment. An afflicted individual also has certain limitations in skills such as communicating, taking care of him or herself, and social/interpersonal skills. Onset of mental retardation occurs before the age of 18 years.
For more information on Mental Retardation, please click on the following links:
- http://www.aamr.org/
- http://www.nlm.nih.gov/medlineplus/ency/article/001523.htm