Differentiating psychotic patients from nonpsychotic patients with the MMPI-2 and Rorschach.
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.
Dao
Tam K
TK
Department of Educational Psychology and Learning Systems, Florida State University, Tallahassee, FL 32306, USA.
Prevatt
Frances
F
Horne
Heather Leveta
HL
D000328:Adult; D003937:Diagnosis, Differential; D006778:Hospitals, Psychiatric; D006801:Humans; D008950:MMPI; D019964:Mood Disorders / Q000145:classification* / Q000175:diagnosis*; D015999:Multivariate Analysis; D010552:Personality Assessment / Q000706:statistics & numerical data; D011594:Psychometrics / Q000706:statistics & numerical data; D011618:Psychotic Disorders / Q000145:classification* / Q000175:diagnosis*; D015203:Reproducibility of Results; D012107:Research Design; D012392:Rorschach Test; D012680:Sensitivity and Specificity