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Factor analysis of the MMPI-STAI
Journal of Clinical Psychology
|July 1, 1975
Summary
This study analyzed Minnesota Multiphasic Personality Inventory (MMPI) and State-Trait Anxiety Inventory (STAI) scores in psychiatric patients. Four anxiety factors emerged, supporting a specific MMPI scale for measuring chronic anxiety.
Area of Science:
- Psychological assessment
- Clinical psychology
- Psychometrics
Background:
- Minnesota Multiphasic Personality Inventory (MMPI) anxiety measures lack differentiation between situational and chronic anxiety.
- State-Trait Anxiety Inventory (STAI) is often used alongside MMPI in clinical settings.
Purpose of the Study:
- To investigate the underlying factor structure of MMPI-STAI scores in psychiatric inpatients.
- To determine if MMPI subscales can differentiate between types of anxiety.
- To compare findings with existing MMPI factor-analytic research.
Main Methods:
- Factor analysis was performed on the MMPI-STAI scores of 311 psychiatric inpatients.
- The emergent factors were interpreted and labeled.
- Results were compared to previous MMPI factor-analytic studies.
Main Results:
- Four distinct factors were identified: Adjustment, Passivity, Somatic Concern, and Anxiety Proneness.
- Welsh's "A" scale demonstrated evidence as a valid measure of chronic anxiety.
- The factor structure provides a more nuanced understanding of anxiety within the MMPI framework.
Conclusions:
- The MMPI, when analyzed with STAI, can reveal distinct dimensions of anxiety beyond simple situational or chronic distinctions.
- Welsh's "A" scale is supported as a specific indicator for chronic anxiety.
- These findings contribute to refining the interpretation of anxiety measures in psychiatric populations.