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Cross-validation of MMPI and MMPI-2 predictor scales

A L Aaronson1, O B Dent, C D Kline

  • 1Department of Veterans Affairs Medical Center, Dayton, Ohio 45428, USA.

Journal of Clinical Psychology
|May 1, 1996
PubMed
Summary

Certain Minnesota Multiphasic Personality Inventory (MMPI) scales predict treatment outcomes. Scales like MAC-R, AAS, and APS negatively correlate with length of stay in addiction treatment.

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Area of Science:

  • Psychology
  • Clinical Psychology
  • Addiction Research

Background:

  • The Minnesota Multiphasic Personality Inventory (MMPI) and its revision (MMPI-2) are widely used psychological assessment tools.
  • Predicting treatment outcomes in addiction recovery is crucial for effective patient care.
  • Several MMPI/MMPI-2 scales are theorized to predict treatment success, but empirical validation is ongoing.

Purpose of the Study:

  • To investigate the predictive validity of 19 MMPI/MMPI-2 scales on treatment outcomes in a domiciliary setting.
  • To examine the relationship between specific MMPI/MMPI-2 scales and length of stay (LOS) or discharge status.

Main Methods:

  • A cohort of 335 subjects undergoing domiciliary treatment was assessed.
  • Nineteen MMPI/MMPI-2 scales, including the revised MacAndrew Alcoholism Scale (MAC-R), Addiction Acknowledgement Scale (AAS), and Addiction Potential Scale (APS), were administered.
  • Statistical correlations were computed between scale scores, length of stay, and discharge status (regular/irregular).

Main Results:

  • The MAC-R, AAS, APS, and Psychopathic Deviate (Pd) scales showed a significant negative correlation with length of stay, suggesting shorter stays for individuals scoring higher on these scales.
  • The AAS also demonstrated a negative correlation with regular/irregular discharge, indicating potential differences in discharge patterns.
  • The majority of the other 15 scales examined did not yield statistically significant correlations with either length of stay or discharge status.

Conclusions:

  • Specific MMPI/MMPI-2 scales, particularly those related to substance use propensity (MAC-R, AAS, APS) and acting-out behaviors (Pd), may serve as indicators for treatment duration in domiciliary settings.
  • The findings suggest that while some scales show predictive value, many others purported to predict treatment outcome do not significantly correlate with length of stay or discharge status in this population.
  • Further research is warranted to refine the use of psychological assessments in predicting and optimizing addiction treatment outcomes.

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