“The threshold I.Q. level for a diagnosis of mental retardation has been progressively lowered over the years, in part because of awareness of the damaging social prejudice suffered by those labeled "retarded." In 1959, the American Association on Mental Deficiency set 85 as the I.Q. below which a person was considered to be retarded.In 1992, the renamed American Association on Mental Retardation lowered the mental retardation "ceiling" to an I.Q. of 70-75,but many mental health specialists argue that people with I.Q.s of up to 80 may also have mental retardation. Flexibility in the I.Q. standard is important because tests given at different times may show slight variations due to differences in the tests and because of testing error -- the standard error measurement on I.Q. tests is generally three to five points.”
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