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The Significance of Significant Differences Among Subtest Scores on the WAIS-R *

Failure to appreciate the distinction between “statistical significance” and “abnormality” can lead to misinterpretation of test results and unwarranted suggestions of psychological deficits. This article suggests that confusion of these concepts underlies the “profile analysis” approach used by some professionals when evaluating discrepancies among subtest scores on the standard Wechsler IQ tests. Data obtained from the test publisher demonstrate that statistically significant discrepancies among WAIS–R subtest scaled scores are not “abnormal” and do not justify inferences of “brain damage” or neuropsychological impairment.