The Assessment of Depression Inventory (ADI): an appraisal of validity in an outpatient sample

In this study we examined the validity of the Assessment of Depression Inventory (ADI) using outpatient participants. The ADI Depression scale (Dep) was compared to three other measures used to assess depression: Beck Depression Inventory-II (BDI-II), Zung Self-Rating Depression Scale (ZSDS), and Personality Assessment Inventory (PAI). Correlations between the ADI and these three measures were significant. An analysis of the discriminant ability of the ADI Dep scale resulted in sensitivities, specificities, positive predictive power, negative predictive power, hit rate, and area under the curve (92.3%) that were supportive of the scale's effectiveness. The ADI Feigning scale (Fg) was compared to the six PAI validity scales. The Fg scale correlated significantly with the PAI Negative Impression Management (NIM) and Positive Impression Management (PIM) scales, and the Malingering (MAL) and Defensive (DEF) indexes. Directionality was as would be predicted. The ADI did not correlate with the two PAI validity scales derived by discriminant analysis function.