A comparison of the MCMI-III personality disorder and modifier indices with the MMPI-2 clinical and validity scales

Area of Science:

• Psychological assessment
• Clinical psychology
• Personality disorders

Background:

• The Millon Clinical Multiaxial Inventory-III (MCMI-III) and Minnesota Multiphasic Personality Inventory-2 (MMPI-2) are widely used psychological assessment tools.
• Understanding the interrelationships between these instruments is crucial for accurate diagnosis and treatment planning.

Purpose of the Study:

• To examine the relationship between the MCMI-III modifier indices and personality disorder scales with the validity and clinical scales of the MMPI-2.
• To investigate the independence of the MMPI-2 F(p) scale in relation to other MMPI-2 and MCMI-III scales.

Main Methods:

• Correlation analysis was used to assess the relationships between MCMI-III and MMPI-2 scales.
• Factor analysis with Promax rotation was employed to explore the underlying structure of the relationships.

Main Results:

• MCMI-III modifier indices showed high correlations with most MMPI-2 validity scales, excluding the F(p) scale.
• MCMI-III personality disorder scales strongly covaried with MMPI-2 validity and clinical scales, except for the F(p) and Mf scales.
• The MMPI-2 F(p) scale demonstrated minimal correlation with other scales, suggesting its variance is largely independent.

Conclusions:

• Clinicians should consider the interplay between personality traits and dissimulation when interpreting assessment results.
• The findings underscore the distinct nature of the MMPI-2 F(p) scale.
• Further research into the nuanced relationships between these personality assessment tools is warranted.