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[Correspondence] Interpretation of results of pooled analysis of individual patient data

The collaborative meta-analysis of individual patient data on percutaneous coronary intervention (PCI) versus coronary artery bypass grafting (CABG) by Stuart J Head and colleagues (March 10, p 939)1 is a very welcome addition to the literature, establishing convincingly the superiority of CABG over PCI on the important outcome of all-cause mortality (hazard ratio 1·20, 95% CI 1·06–1·37; p=0·004). However, the conclusions offered by the authors are methodologically incorrect and their publication in a major journal surprising.