Interpreting the Personality Assessment Inventory (PAI) validity scales: Leveraging population-level Veteran Affairs...

Area of Science:

• Psychological Assessment
• Clinical Psychology
• Veteran Mental Health

Background:

• The Personality Assessment Inventory (PAI) is a widely used tool for psychological assessment.
• Understanding validity scale performance is crucial for accurate interpretation of PAI results, especially in specific populations like U.S. veterans.

Purpose of the Study:

• To determine the base rates of invalidity across all 18 validity scales of the PAI in a large sample of U.S. veterans.
• To examine the intercorrelations among PAI validity scales within this population.
• To investigate how invalidity rates vary by clinic type.

Main Methods:

• Analysis of 36,830 PAI administrations from the Veteran Affairs Corporate Data Warehouse.
• Calculation of base rates for overreport, underreport, and noncontent response scales.
• Spearman's correlation analysis to assess relationships between validity scales.
• Stratification of data by clinic stop codes.

Main Results:

• Overreport scales showed the highest invalidity rates (10.1%-29.9%), while underreport (0.4%-7.5%) and noncontent response (3.4%-4.5%) rates were lower.
• Strong correlations were found among most overreport scales and among underreport scales, with some exceptions.
• Overreporting was highest in disability clinics and lowest in presurgical evaluations; underreporting was rare except in presurgical contexts.

Conclusions:

• Symptom validity assessment is essential when working with veterans, particularly concerning potential overreporting in disability claims and underreporting in presurgical evaluations.
• The findings provide valuable data on PAI validity scale performance in a large veteran cohort.
• Patterns of invalidity observed are consistent with previous research using other assessment tools.