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How were the different degrees of mental retardation classified?

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The introduction of the IQ test was followed by a classification system that used such terms as moron (IQ of 51-70), imbecile (26-50), and idiot (0-25); later these terms were softened and classifications redefined somewhat to mild (IQ of 55-70), moderate (40-54), severe (25-39), and profound (0-24) retardation.

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