To the Editor: Dr Brown and colleagues1 studied the effectiveness of cognitive therapy for the prevention of suicide attempts. This randomized controlled trial appears to show a benefit to introducing cognitive therapy in these patients. Randomization will on average create comparable groups at baseline, but it is possible that bias could have occurred at a later point in the intervention because the study was not blinded.2
Filion KB, Delaney JAC. Cognitive Therapy and Preventing Suicide Attempts. JAMA. 2005;294(22):2847–2848. doi:10.1001/jama.294.22.2847-c
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