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What is propensity score modelling?
  1. Michael J Campbell
  1. Design, Trials and Statistics, ScHARR, University of Sheffield, Sheffield, UK
  1. Correspondence to Professor Michael J Campbell, Emeritus Professor of Medical Statistics, Design, Trials and Statistics, ScHARR, University of Sheffield S1 4DA UK; m.j.campbell{at}


Propensity score methodology is being increasingly used to try and make inferences about treatments when randomised trials are either impossible or not conducted and the only data are from observational studies. This paper reviews the basis of propensity scores and the current state of knowledge about them. It uses and critiques a current paper in the Emergency Medicine Journal to illustrate the methodology.

  • Statistics
  • anaesthesia
  • research methods

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