Comparison of MMPI-2 validity scale scores of personal injury litigants and disability claimants

Five validity scales derived from the Minnesota Multiphasic Personality Inventory-2 (MMPI-2), the Infrequency Scale (F), Infrequency-Psychopathology Scale (F[p]), Symptom Validity Scale (FBS), Henry-Heilbronner Index (HHI), and Response Bias Scale (RBS) were evaluated in 118 litigation patients (LPs) and 163 clinical patients (CPs). Varied statistical methods, including hierarchical logistic regression analyses, Receiver Operating Characteristic (ROC) curve, Area Under the Curve (AUC) values, and sensitivity/specificity analyses, showed that RBS performed better than the other four scales in identifying LPs. The regression analyses found RBS to be the most significant predictor of LP and CP group membership (p < .001). The effectiveness of RBS in identifying LPs, all of whom reported neuropsychological symptoms, was attributed to its development based on cognitive effort test scores.