Psychiatric patients were administered the Minnesota Multiphasic Personality Inventory (MMPI), its revision (MMPI-2), or both, in a counterbalanced repeated-measures design. MMPI-2 T scores were found to be significantly lower than MMPI T scores on several of the clinical scales. Subject rank order on T scores and dispersion of the basic clinical scales did not differ between the tests, and measures of profile similarity indicated congruence between the two instruments
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Harrell et al. (1992) studied this question.