To the Editor Sloan and colleagues1 reported noninferiority of 5-session written exposure therapy (WET) to 12-session cognitive processing therapy (CPT) in patients with posttraumatic stress disorder (PTSD). However, several aspects of the study require some clarification. First, was researcher allegiance controlled for? Written exposure therapy and CPT were carried out by the same therapists who were supervised by 2 of the authors. Second, the value of a noninferiority or equivalence study depends on how well the equivalence margin can be justified.2
Leichsenring F, Steinert C. Written Exposure Therapy vs Cognitive Processing Therapy. JAMA Psychiatry. 2018;75(7):757. doi:10.1001/jamapsychiatry.2018.0807
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