Abstract
The goal of this study was to examine the incremental validity and the clinical utility of the Minnesota Multiphasic Personality Inventory–2 (MMPI–2; (Butcher, Dahlstrom, Graham, Tellegen, & Kaemmer, 1989) and Rorschach (Rorschach, 1942) with regard to differential diagnosis in a sample of adult inpatients with a primary psychotic disorder or a primary mood disorder without psychotic features. Diagnostic efficiency statistics have suggested that the Rorschach Perceptual Thinking Index (PTI; Exner, 2000a, 2000b) was better than MMPI–2 scales in discriminating psychotic patients from nonpsychotic patients. We compared the 84% overall correct classification rate (OCC) for the PTI to an OCC of 70% for the MMPI–2 scales. Adding the MMPI–2 scales to the PTI resulted in a decrease in OCC of 1%, whereas adding the PTI to the MMPI–2 resulted in an increase in OCC of 14%. Sensitivity, specificity, positive predictive power, negative predictive power, and kappa were equal or higher with only the PTI in the model.
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