Development and validation of an MMPI-3 Antagonism scale.

Area of Science:

• Psychological assessment
• Personality psychology
• Clinical psychology

Background:

• Antagonism is a key personality domain linked to externalizing behaviors and personality disorders.
• Accurate assessment of antagonism is crucial for research and clinical applications.
• Existing measures like the aggressiveness (AGGR) scale on the MMPI-3 have limited content coverage.

Purpose of the Study:

• To develop and validate a new Antagonism (ANT) scale for the Minnesota Multiphasic Personality Inventory-3 (MMPI-3).
• To improve the assessment of antagonism compared to existing measures.
• To ensure the scale is suitable for diverse populations.

Main Methods:

• Scale development involved criterion validity and latent modeling with candidate items across six samples (N=289-1,660).
• Validation studies assessed convergent, incremental, and discriminant validity against antagonism and disinhibition criteria.
• Analyses utilized data from university, community, and mental health settings.

Main Results:

• The newly developed ANT scale demonstrated improved content coverage of antagonism.
• ANT scale scores showed superior construct validity compared to the AGGR scale.
• The ANT scale exhibited strong convergent and incremental validity for antagonism and discriminant validity against disinhibition.

Conclusions:

• The MMPI-3 ANT scale is a promising and valid measure for assessing antagonism.
• The ANT scale offers enhanced content coverage and construct validity over the AGGR scale.
• This new scale represents a meaningful addition to the MMPI-3 for personality assessment.