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Comparing Classes of Psychotherapeutic Interventions

A Review and Reanalysis of English- and German-Language Meta-Analyses

San Diego State University

This article explores how substantive and methodological differences between English- and German-language psychotherapy outcome studies may have contributed to observed differences in their effectiveness. Data from the meta-analyses by Smith, Glass, and Miller and Wittmann and Matt were reanalyzed to examine the extent to which substantive and methodological differences can account for the difference in the overall effect size of psychotherapy published in English- and German-language sources. The findings indicate that differences in the study of simple phobias, the use of trait inventories as outcome measures, and the selection of effect sizes within studies are likely to have led Smith et al. to overestimate, or conversely, Wittmann and Matt to underestimate the benefits of psychotherapy. Such results suggest that average effect estimates derived for English- and German-language psychotherapy outcomes studies depend on, and have to be interpreted in, the cultural context in which the research is being conducted and reviewed. The comparison between different classes of interventions has to take into account how this context shapes the effect derived for such classes.

Journal of Cross-Cultural Psychology, Vol. 24, No. 1, 5-25 (1993)
DOI: 10.1177/0022022193241001


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