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Correspondence of the MMPI-2 and MCMI-II in male substance abusers

L C Ward1

  • 1Veteran's Administration Medical Center, Tuscaloosa, AL, USA.

Journal of Personality Assessment
|April 1, 1995
PubMed

Insights

The Minnesota Multiphasic Personality Inventory-2 (MMPI-2) and Millon Clinical Multiaxial Inventory-II (MCMI-II) identified similar emotional maladjustment and antisocial traits in men with substance use disorders, suggesting construct validity.

Area of Science:

  • Psychology
  • Clinical Psychology
  • Psychometrics

Background:

  • Substance use disorders are complex conditions often co-occurring with personality and emotional difficulties.
  • Accurate assessment of personality and psychopathology is crucial for effective treatment planning in substance use disorder populations.
  • The Minnesota Multiphasic Personality Inventory-2 (MMPI-2) and Millon Clinical Multiaxial Inventory-II (MCMI-II) are widely used psychometric tools for assessing personality and psychopathology.

Purpose of the Study:

  • To compare the structural validity of the MMPI-2 and MCMI-II in a sample of men with substance use disorders.
  • To determine if principal component analysis of MMPI-2 and MCMI-II scales reveals similar underlying dimensions in this population.
  • To assess the convergent validity of the two instruments by examining correlations between their principal components.

Main Methods:

  • A sample of 306 men diagnosed with substance use disorders completed both the MMPI-2 and MCMI-II.
  • Scores from 45 MMPI-2 scales and 25 MCMI-II scales were subjected to separate principal component analyses.
  • The number of components extracted was determined by eigenvalues greater than one, resulting in seven components for the MMPI-2 and five for the MCMI-II.

Main Results:

  • The first two principal components from both the MMPI-2 and MCMI-II analyses accounted for a substantial portion of the explained variance.
  • These primary components demonstrated strong positive correlations across the two tests.
  • The first two components were consistently interpreted as representing Emotional Maladjustment and Antisocial Traits for both the MMPI-2 and MCMI-II.

Conclusions:

  • The MMPI-2 and MCMI-II appear to measure overlapping latent constructs related to emotional maladjustment and antisocial traits in men with substance use disorders.
  • The findings support the convergent validity of these two prominent personality assessment instruments within this clinical population.
  • Principal component analysis provides a useful method for examining the structural similarities and differences between psychometric tests in specific diagnostic groups.

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