Does the MMPI-168 exaggerate psychotic pathology?

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.