Research methods for meta-analyses.

  title={Research methods for meta-analyses.},
  author={Nathan Leon Pace},
  journal={Best practice & research. Clinical anaesthesiology},
  volume={25 4},
Meta-analysis uses numerical tools to pool data and to estimate a summary effect size for the comparison of two interventions from a set of randomised controlled trials identified in a systematic review. An effect size is a single number that expresses the difference in outcome from the interventions. The most commonly used effect sizes for dichotomous outcomes, for example, mortality, are the odds ratio and the relative risk. The results of a meta-analysis are usually presented in a complex… CONTINUE READING

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