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Concurrent validity of the MCMI-II modifier indices
M A Blais1, K B Benedict, D K Norman
1Inpatient Psychiatry Service, Massachusetts General Hospital, Boston, 02114, USA.
Abstract:
The relationships between the three Modifier Indices (Disclosure X, Desirability Y, and Debasement Z) of the Millon Clinical Multiaxial Inventory-II (MCMI-II) and the validity and clinical scales of the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) were explored. A sample of 125 psychiatric inpatients was administered both personality measures within 7 days of admission. The pattern of Pearson correlation coefficients and principal component factors was seen as generally supporting the validity of the three MCMI-II Modifier Indices. However, the Disclosure and Debasement Indices were highly intercorrelated and similar in their MMPI-2 associations. The Desirability Index functioned in a more unique manner and demonstrated both convergent and divergent relationships with MMPI-2 Validity and Clinical scales.
Insights
This study explored Millon Clinical Multiaxial Inventory-II (MCMI-II) Modifier Indices and Minnesota Multiphasic Personality Inventory-2 (MMPI-2) scales. Findings generally support MCMI-II validity, though Disclosure and Debasement indices showed overlap.
Area of Science:
- Psychological assessment
- Clinical psychology
- Personality disorders
Background:
- The Millon Clinical Multiaxial Inventory-II (MCMI-II) is a widely used tool for personality disorder assessment.
- Understanding the relationship between different personality inventories enhances diagnostic accuracy and validity.
- The MCMI-II Modifier Indices (Disclosure, Desirability, Debasement) provide crucial information about response validity.
Purpose of the Study:
- To investigate the psychometric relationships between the MCMI-II Modifier Indices and the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) scales.
- To assess the convergent and divergent validity of the MCMI-II Modifier Indices using the MMPI-2 as a benchmark.
- To determine the extent to which MCMI-II Modifier Indices reflect response styles and personality constructs measured by the MMPI-2.
Main Methods:
- A sample of 125 psychiatric inpatients completed both the MCMI-II and MMPI-2 within seven days of admission.
- Pearson correlation coefficients were calculated to examine the associations between MCMI-II Modifier Indices and MMPI-2 scales.
- Principal component factor analysis was employed to explore the underlying structure of the relationships.
Main Results:
- The overall pattern of correlations generally supported the validity of the MCMI-II Modifier Indices.
- The MCMI-II Disclosure and Debasement Indices were highly intercorrelated and exhibited similar associations with MMPI-2 scales.
- The MCMI-II Desirability Index demonstrated a more unique pattern of relationships, showing both convergent and divergent validity with MMPI-2 scales.
Conclusions:
- The findings provide empirical support for the validity of the MCMI-II Modifier Indices in assessing response styles.
- The high intercorrelation between Disclosure and Debasement suggests potential overlap in the constructs they measure.
- The distinct functioning of the Desirability Index highlights its unique contribution to understanding response patterns in personality assessment.