Process-Outcome Associations in an Interdisciplinary Treatment for Chronic Pain and Comorbid Mental Disorders Based on Acceptance and Commitment Therapy.

The present investigation suggests that changes in pain acceptance, mindfulness, and psychological flexibility are meaningfully associated with changes in clinical outcomes. It provides evidence on particular process-outcome associations that had not been investigated in this way before. The focus on comorbid mental disorders informs clinicians about a population of chronic pain patients who often have a severe course of illness and have seldom been studied.