13 July 2008 – *Clinical Psychology Review* (vol. 28, #5) includes an article: “The
relative efficacy of bona fide psychotherapies for treating post-
traumatic stress disorder: A meta-analysis of direct comparisons” by
Steven Benish, Zac Imel, & Bruce Wampold.

Here’s the abstract: “Psychotherapy has been found to be an effective
treatment of post-traumatic stress disorder (PTSD), but meta-analyses
have yielded inconsistent results on relative efficacy of
psychotherapies in the treatment of PTSD. The present meta-analysis
controlled for potential confounds in previous PTSD meta-analyses by
including only bona fide psychotherapies, avoiding categorization of
psychotherapy treatments, and using direct comparison studies only. The
primary analysis revealed that effect sizes were homogenously
distributed around zero for measures of PTSD symptomology, and for all
measures of psychological functioning, indicating that there were no
differences between psychotherapies. Additionally, the upper bound of
the true effect size between PTSD psychotherapies was quite small. The
results suggest that despite strong evidence of psychotherapy
efficaciousness vis-à-vis no treatment or common factor controls, bona
fide psychotherapies produce equivalent benefits for patients with PTSD.”