Prediction of psychotherapy process and outcome with the Personality Assessment Inventory

The Personality Assessment Inventory (PAI; Morey, 1991) contains scales that were designed to make predictions about how an individual might respond to treatment, thereby allowing clinicians to attune treatment plans to a client's specific needs. The present study utilized two features of the PAI as predictors of treatment process and outcome in a sample of 47 outpatient veterans: the Treatment Rejection (RXR) scale and the Treatment Process Index (TPI). Data were collected for three treatment process and outcome measures: treatment utilization (ratio of appointments attended to appointments scheduled), therapist-rated therapeutic alliance, and symptom change over time. Results indicated that RXR significantly predicted utilization over and above the TPI. The TPI significantly predicted the rate of distress symptom decline over time, but RXR did not. Lastly, neither RXR nor the TPI were significant predictors of therapist-rated alliance.