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Comment & Response
January 5, 2016

Mindfulness-Based Stress Reduction for Veterans With PTSD—Reply

Author Affiliations
  • 1Minneapolis Veterans Affairs Health Care System, Minneapolis, Minnesota
JAMA. 2016;315(1):88-89. doi:10.1001/jama.2015.15173

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