• S D Walter and T Sinuff.
• Department of Clinical Epidemiology and Biostatistics, McMaster University, 1200 Main Street West, HSC-2C16, Hamilton, Ontario, Canada L8N 3Z5. walter@mcmaster.ca
• J Clin Epidemiol. 2007 May 1; 60 (5): 530-4.

ObjectiveTo develop an approach by which studies describing the accuracy of diagnostic tests or clinical predictions can be combined in a meta-analysis, even though studies may report their results using different summary measures.Study DesignA method is proposed to allow algebraic and numerical conversion of values of the Receiver Operating Characteristic Area Under the Curve (AUC) summary statistic into corresponding odds ratios (OR). A similar conversion is demonstrated for the standard errors (SEs) of these summary statistics.ResultsThe conversion of the AUC values into OR values was achieved using a logit-threshold model. The delta method was used to convert the associated SEs. An example concerning predictions of mortality in the intensive care unit illustrates the calculations.ConclusionThis paper provides an accessible method that permits the meta-analyst to overcome some of the difficulties implied by incomplete and inconsistent reporting of research studies in this area. It allows all studies to be included on the same metric, which in turn more easily permits exploration of issues such as heterogeneity. The method can readily be used for meta-analyses of diagnostic or screening tests, or for prediction data.

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