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Letters
March 4, 2009

Analyzing Effectiveness of Long-term Psychodynamic Psychotherapy—Reply

JAMA. 2009;301(9):930-933. doi:10.1001/jama.2009.181

In Reply: In response to Dr Thombs and colleagues, because the number of controlled trials of LTPP was relatively small, we assessed within-group effect sizes in all studies. In the controlled studies, we found significantly larger within-group effect sizes in the LTPP conditions than in the control conditions. To assess the extent of this difference, we transformed the point biserial correlations used for tests of significance into between-group effect sizes in the form of a d statistic.1

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