The definition and procedures for diagnosing mental retardation vary from state to state, but an IQ of 75 is generally considered to be a cutoff score in the diagnosis.

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The generally accepted cutoff score for a diagnosis of intellectual disability (formerly known as mental retardation) is an IQ of approximately 70 or below, not 75. This is combined with significant limitations in two or more areas of adaptive behavior such as communication, self-care, and social skills.

The Definition and Procedures for Diagnosing Mental Retardation Vary from State