Multivariate analysis compares MMPI-168 with other scoring versions, showing it may exaggerate psychotic symptoms in psychiatric patients.
Three scoring versions of the MMPI, scored on the same protocol, were compared in a multivariate design with 198 psychiatric patients. The MMPI-168 schizophrenia scale had a statistically higher elevation than the Dutch and American scoring versions. This makes MMPI-168 profiles more often "schizophrenic" than other scoring versions. The MMPI-168 systematically overscores the presence of "psychotic" code types, 45% of all protocols. Implications of the findings are discussed
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Dingemans et al. (1996) studied this question.
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