Missing Second Clinical Trial Registration Identifier and Clarification of Outcome Measures

In the Original Investigation titled “Effect of Group vs Individual Cognitive Processing Therapy in Active-Duty Military Seeking Treatment for Posttraumatic Stress Disorder: A Randomized Clinical Trial,” published in the January issue of JAMA Psychiatry,¹ a second clinical trial registration identifier was inadvertently omitted from the Abstract. In addition, further explanation was needed in the Participants and Measures subsections of the Methods section to clarify the reported outcomes of the study. This article was corrected online.²