An external criterion study of the MMPI validity indices

Area of Science:

• Psychological assessment
• Veterans' mental health
• Clinical psychology

Background:

• Accurate assessment of mental health is crucial for veterans seeking treatment.
• Dissimulation, or faking bad, can complicate diagnostic and treatment processes.
• The Minnesota Multiphasic Personality Inventory (MMPI) includes validity scales to detect response biases.

Purpose of the Study:

• To evaluate the utility of MMPI validity indicators in predicting dissimulation during structured interviews among veterans.
• To determine if MMPI scales F and F-K correlate with "fake bad" interview behavior.

Main Methods:

• Administered the MMPI and the Clinician-Administered Psychopathology Rating Scale (CAPPS) to 228 veterans seeking VA treatment.
• Assessed MMPI validity indicators (F and F-K scales).
• Rated "fake bad" interview behavior during structured mental status examinations.

Main Results:

• Found statistically significant relationships between MMPI scales F and F-K and "fake bad" interview behavior.
• Observed correlations were small, indicating limited practical utility.
• The effort required to administer and score the MMPI may outweigh the predictive value for dissimulation.

Conclusions:

• MMPI validity scales have limited practical utility in predicting dissimulation in structured veteran interviews.
• Further research may be needed to develop more effective methods for detecting response bias in this population.