MMPI personality disorder scales and the MCMI: concurrent validity

Area of Science:

• Psychological assessment
• Psychopathology
• Personality disorders

Background:

• The Minnesota Multiphasic Personality Inventory (MMPI) has new scales for DSM-III personality disorders.
• Assessing the validity of these new MMPI scales is crucial for clinical utility.

Purpose of the Study:

• To evaluate the concurrent validity of the new MMPI personality disorder scales.
• To compare MMPI personality disorder scale scores with the Millon Clinical Multiaxial Inventory (MCMI) personality disorder scales.

Main Methods:

• Concurrent validity was assessed by comparing MMPI personality disorder scale scores with MCMI personality disorder scale scores.
• The study included 47 psychiatric patients.
• Both overlapping and nonoverlapping MMPI personality disorder scales were analyzed.

Main Results:

• Most MMPI personality disorder scales demonstrated significant correlations with their corresponding MCMI scales.
• The MMPI antisocial (ANT), compulsive (CPS), and paranoid (PAR) scales did not achieve adequate concurrent validity.
• Differences in conceptual frameworks (DSM-III vs. Millon typology) may explain the poor validity of the ANT scale.

Conclusions:

• The MMPI personality disorder scales show promising concurrent validity, but specific scales need refinement.
• The MMPI paranoid scale may assess paranoid ideation rather than paranoid personality traits.
• Further research is needed to understand the discrepancies in validity for certain MMPI scales.