What types of mental retardation are described by the term cultural-familial?

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Cultural-familial mental retardation refers to impairments in intellectual functioning that are believed to be mostly caused by environmental factors such as poverty, inadequate nutrition, lack of stimulation, and limited opportunities for education. While genetics may play a role, this type of mental retardation is not linked to chromosomal abnormalities, drug abuse during pregnancy, or sexually transmitted diseases.

What Types of Mental Retardation Are Described by the Term