Evidence-based psychotherapy completion and symptom improvement among returning combat veterans with PTSD.

OBJECTIVE: Despite the availability of evidence-based psychotherapy (EBP) for posttraumatic stress disorder (PTSD) in the Veterans Health Administration, treatment completion rates are low and not all veterans benefit from these treatments. Understanding factors associated with PTSD EBP completion and symptom improvement is critical to improving completion rates and effectiveness. METHOD: This chart review study used the Andersen Behavioral Model to examine whether predisposing characteristics (nonmodifiable characteristics such as demographics), enabling factors (modifiable logistic variables that can facilitate or impede treatment use), and need factors (clinical characteristics such as symptom severity or comorbidities) predicted treatment completion or symptom improvement following PTSD EBP treatment among 82 Iraq and Afghanistan combat veterans. Logistic regression was used to examine treatment completion, and repeated measures analysis of variance was used to examine changes in PTSD and depression symptoms following treatment. RESULTS: EBP completers had greater improvement in PTSD symptoms than did EBP dropouts. Need factors (lack of comorbid substance use disorders and having problems with family members/significant others) were related to treatment completion, whereas enabling resources (receiving individual rather than group treatment) were related to symptom improvement. CONCLUSIONS: This is one the first studies to use a comprehensive model to examine factors relevant to treatment completion and symptom improvement. Results suggest that nonmodifiable predisposing characteristics do not drive treatment completion and symptom improvement, underscoring the potential importance of targeting enabling resources and needs factors for intervention. (PsycINFO Database Record (c) 2019 APA, all rights reserved).