To the Editor The randomized clinical trial by Dr Foa and colleagues1 compared massed prolonged exposure therapy, spaced prolonged exposure therapy, present-centered therapy, and a minimal-contact control on severity of posttraumatic stress disorder (PTSD) among active duty military personnel. The results were different from what was expected from previous studies.2 Individuals receiving spaced therapy did no better than those randomized to present-centered therapy, a comparison condition to control for common factors in psychotherapy. Foa and colleagues and the Editorial by Hoge and Chard3 were unable to explain these results.
Roth WT, Hofmann SG. Motivation to Participate in PTSD Research. JAMA. 2018;319(23):2439–2440. doi:10.1001/jama.2018.4326
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