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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. Among subjects who completed both the MMPI and the MMPI-2, code-type concordance was not significantly lower than stability rates of the tests. The results support the assignment of 65T as the lower boundary of clinical elevation on the MMPI-2 and the psychometric equivalence of the MMPI-2 and the MMPI with respect to mean r scores, score rankings, and measures of score distribution.

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