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Post-traumatic stress disorder (PTSD) can be difficult to treat, with gains often particularly modest in combat veterans. Although group-based treatments are commonly delivered for veterans, little is known about factors influencing their outcomes. Attachment style is known to be associated with psychopathology after trauma and is critical to group-based interventions, but has not yet been investigated in relation to treatment outcome. A better understanding of factors that influence outcome is critical in optimizing the effectiveness of such interventions. This study investigated attachment style as a predictor of outcome for 103 veterans attending group-based treatment for combat-related PTSD. Measures included the Clinician Administered PTSD Scale, PTSD Checklist, and Relationship Styles Questionnaire. Path analyses indicated preoccupied attachment style strongly negatively predicted outcome following …