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Letters | March 4, 2009

Analyzing Effectiveness of Long-term Psychodynamic Psychotherapy

Brett D. Thombs, PhD; Marielle Bassel, BA; Lisa R. Jewett, BA

JAMA. 2009;301(9):930-933. doi:10.1001/jama.2009.177.

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To the Editor: Drs Leichsenring and Rabung¹ reported that long-term psychodynamic psychotherapy (LTPP) is more effective than shorter forms of psychotherapy for complex mental disorders based on a between-group effect size of 1.8 from 7 comparative trials that they meta-analyzed. The authors did not indicate that they were concerned about this and other surprisingly large effect sizes they reported.

Between-group effect sizes can be presented as group differences in terms of standard deviations or as point biserial correlations between group (eg, LTPP vs shorter-term therapies) and treatment effect. They are equivalent and convertible using a formula or tables.² The authors, however, apparently erroneously calculated within-group pre-post effect sizes and point biserial correlations between group and within-group effect sizes, which is altogether different. It seems that they converted these correlations between group and within-group pre-post effect sizes to produce deviation-based effect sizes that do not appear reasonable.

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March 4, 2009

Analyzing Effectiveness of Long-term Psychodynamic Psychotherapy

Levente Kriston, PhD; Lars Hölzel, MA; Martin Härter, MD, PhD

JAMA. 2009;301(9):930-933. doi:10.1001/jama.2009.178.

March 4, 2009

Analyzing Effectiveness of Long-term Psychodynamic Psychotherapy

Aaron T. Beck, MD; Sunil S. Bhar, PhD

JAMA. 2009;301(9):930-933. doi:10.1001/jama.2009.179.

March 4, 2009

Analyzing Effectiveness of Long-term Psychodynamic Psychotherapy

Stefan Roepke, MD; Babette Renneberg, PhD

JAMA. 2009;301(9):930-933. doi:10.1001/jama.2009.180.

March 4, 2009

Analyzing Effectiveness of Long-term Psychodynamic Psychotherapy—Reply

Falk Leichsenring, DSc; Sven Rabung, PhD

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

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Thombs BD, Bassel M, Jewett LR. Analyzing Effectiveness of Long-term Psychodynamic Psychotherapy. JAMA. 2009;301(9):930-933. doi:10.1001/jama.2009.177.

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