Psychological Trauma: Theory, Research, Practice, and Policy (Aug 27, 2018). DOI:10.1037/tra0000358 Objective and method: Numerous risk factors for posttraumatic stress disorder (PTSD) have been identified; however, many do not inform treatment. Psychological inflexibility is a modifiable factor that can be targeted in psychological treatment. This study examined whether higher levels of psychological inflexibility predicted unique variance in PTSD symptom severity at 1-year follow-up in 236 U.S. veterans of the wars in Iraq in Afghanistan after accounting for the strongest known risk factors for PTSD. To read the full article, log in using your NHS OpenAthens details.