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Identifying non-affective psychosis in first admission patients: MMPI-2, structured diagnostic interview, and

John W Carter1, Julie Nordgaard2, Josef Parnas3

  • 1Department of Counseling and Human Services, School of Education, University of Redlands, 1200 E. Colton Ave., Redlands, CA 92373, USA; Carter Strategic Research, Granada Hills, California, USA.

Psychiatry Research
|July 17, 2019
PubMed
Abstract

Insights

The Minnesota Multiphasic Personality Inventory-2 (MMPI-2) shows promise in identifying early psychosis, performing comparably to the SCID. Combining the MMPI-2 with the SCID enhances diagnostic accuracy for psychosis.

Area of Science:

  • Psychiatry
  • Psychological Assessment
  • Clinical Psychology

Background:

  • Accurate diagnosis of psychosis is crucial for effective treatment.
  • The Structured Clinical Interview for DSM-IV (SCID) is a standard diagnostic tool.
  • The Minnesota Multiphasic Personality Inventory-2 (MMPI-2) is a widely used psychological assessment instrument.

Purpose of the Study:

  • To evaluate the diagnostic efficacy of the MMPI-2 in identifying psychosis.
  • To compare the diagnostic performance of the MMPI-2 against the SCID.
  • To assess the incremental validity of the MMPI-2 when used in conjunction with the SCID.

Main Methods:

  • 76 first-admission patients were diagnosed using DSM-IV criteria by two psychiatrists.
  • Patients were categorized into non-affective psychosis and other mental illness groups.
  • Diagnostic performance was assessed by comparing MMPI-2 and SCID results against consensus diagnoses.

Main Results:

  • MMPI-2 scales 8 (Schizophrenia) and BIZ (Bizarre Mentations) identified 58% and 56% of psychotic patients, respectively.
  • The SCID correctly identified only 25% of non-affective psychosis patients.
  • Combining the MMPI-2 with the SCID improved the overall correct classification rate to 73% and identified 66% of the psychosis group.

Conclusions:

  • The MMPI-2 demonstrates comparable or superior ability to identify early psychosis compared to the SCID.
  • Integrating the MMPI-2 with the SCID offers incremental diagnostic validity, enhancing psychosis detection.
Keywords:
Goldberg IndexIncremental validityMMPI-2SCIDSchizophrenia

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