Letters Section Editor: Jody W. Zylke, MD, Senior Editor.
Author Affiliations: Ryerson University, Toronto, Ontario, Canada (Dr Monson; firstname.lastname@example.org); Women's Health Sciences Division, VA National Center for PTSD, Boston, Massachusetts (Dr Resick); and Executive Division, VA National Center for PTSD, White River Junction, Vermont (Dr Schnurr).
In Reply: Dr Prasad contends that a wait list may be a particularly poor control in PTSD studies and expresses concern that waiting for cognitive-behavioral conjoint therapy may have caused a worsening in symptoms, thereby making the intervention appear falsely beneficial relative to the wait-list condition. In a randomized design, a wait list controls for common threats to internal validity such as selection, maturation, history, testing, and regression to the mean.1,2
Monson CM, Resick PA, Schnurr PP. Couple Therapy for Posttraumatic Stress Disorder—Reply. JAMA. 2012;308(23):2458. doi:10.1001/jama.2012.14573