The Personalized Advantage Index: Translating Research on Prediction into Individualized Treatment Recommendations. A Demonstration |
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Authors: | Robert J DeRubeis Zachary D Cohen Nicholas R Forand Jay C Fournier Lois A Gelfand Lorenzo Lorenzo-Luaces |
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Institution: | 1. Department of Psychology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.; 2. Department of Psychiatry, The Ohio State University, Columbus, Ohio, United States of America.; 3. Department of Psychiatry, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America.; Queen Elizabeth Hospital, Hong Kong, |
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Abstract: | BackgroundAdvances in personalized medicine require the identification of variables that predict differential response to treatments as well as the development and refinement of methods to transform predictive information into actionable recommendations.ObjectiveTo illustrate and test a new method for integrating predictive information to aid in treatment selection, using data from a randomized treatment comparison.MethodData from a trial of antidepressant medications (N = 104) versus cognitive behavioral therapy (N = 50) for Major Depressive Disorder were used to produce predictions of post-treatment scores on the Hamilton Rating Scale for Depression (HRSD) in each of the two treatments for each of the 154 patients. The patient''s own data were not used in the models that yielded these predictions. Five pre-randomization variables that predicted differential response (marital status, employment status, life events, comorbid personality disorder, and prior medication trials) were included in regression models, permitting the calculation of each patient''s Personalized Advantage Index (PAI), in HRSD units.ResultsFor 60% of the sample a clinically meaningful advantage (PAI≥3) was predicted for one of the treatments, relative to the other. When these patients were divided into those randomly assigned to their “Optimal” treatment versus those assigned to their “Non-optimal” treatment, outcomes in the former group were superior (d = 0.58, 95% CI .17—1.01).ConclusionsThis approach to treatment selection, implemented in the context of two equally effective treatments, yielded effects that, if obtained prospectively, would rival those routinely observed in comparisons of active versus control treatments. |
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