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Borderline intellectual disability, also known as borderline intelligence, borderline intellectual functioning, or marginal intelligence, is diagnosed when someone has a below-average measured intelligence. There are patterns of persistently slow learning of basic motor and language skills ("milestones") during childhood, and a significantly below-normal global intellectual capacity as an adult. The measured intelligence quotient (IQ) is between 70-79.
The term reflects the attempt to identify the level of intellectual capacity at which people could function independently and at which point outside help would be necessary. So the term "borderline" denotes that people in this group are on the cusp of this division.
Diagnosis should include adaptive functioning skills as well as IQ. A loved one can fill out an adaptive behavior rating scale. Diagnosis will involve IQ, adaptive behavior, and the examiner's observations of the person.
Epidemiology[]
- Main article: Epidemiology of borderline intellectual disability