In Reply Ms Goulao and Mr MacLennan state that when interventions are delivered in group format by the same therapists, within-group correlation due to shared therapist effects may be introduced, violating the assumption of independence underlying commonly used statistical methods.1 This suggests that findings reported in our trial comparing mindfulness-based stress reduction with present-centered group therapy for the treatment of PTSD might reflect shared therapist effects rather than shared treatment effects.2
Thuras P, Polusny MA, Lim KO. Mindfulness-Based Stress Reduction for Veterans With PTSD—Reply. JAMA. 2016;315(1):88–89. doi:10.1001/jama.2015.15173
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