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Comparability of MMPI-2 scales and profiles over time
1Department of Counselor Education and Counseling Psychology, Western Michigan University, Kalamazoo 49008-5226, USA. patrick.munley@wmich.edu
Journal of Personality Assessment
|April 9, 2002
Summary
The Minnesota Multiphasic Personality Inventory-2 (MMPI-2) shows good scale and profile comparability in mental health patients over time. This suggests the MMPI-2 is a reliable tool for tracking treatment progress in clinical settings.
Area of Science:
- Psychological assessment
- Clinical psychology
- Psychometrics
Background:
- The Minnesota Multiphasic Personality Inventory-2 (MMPI-2) is a widely used psychological assessment tool.
- Assessing the reliability and comparability of MMPI-2 scores over time is crucial for clinical decision-making.
- Previous research has established the test-retest reliability of the MMPI-2, but further investigation in specific clinical populations is warranted.
Purpose of the Study:
- To investigate the scale and profile comparability of the MMPI-2 in mental health patients undergoing treatment.
- To determine the test-retest reliability of MMPI-2 scales and profile configurations over extended periods.
- To examine the consistency of MMPI-2 results across multiple administrations within a clinical treatment context.
Main Methods:
- The study analyzed MMPI-2 data from 114 mental health patients at a Veterans Affairs Medical Center.
- MMPI-2 tests were administered on two separate occasions, with a mean interval of 688 days between administrations.
- Test-retest correlation coefficients were calculated for Basic, Supplementary, and Content scales, alongside agreement percentages for high-point configurations.
Main Results:
- Test-retest correlation coefficients for the entire sample ranged from .48 to .80 across different scale types.
- Scale high-point agreement was 38.60%, with high 2-point and 3-point agreement at 16.67% and 19.30%, respectively.
- Pearson correlation coefficients for T scores averaged .78, indicating similarity in profile shape across testing occasions.
Conclusions:
- The MMPI-2 demonstrates good scale and profile comparability for mental health patients over extended treatment intervals.
- These findings support the utility of the MMPI-2 as a reliable instrument for monitoring psychological changes and treatment progress in clinical settings.
- The study underscores the stability of MMPI-2 profiles, reinforcing its value in longitudinal assessments of psychiatric populations.