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Towards evidence based medicine for paediatricians
  1. Bob Phillips
  1. Correspondence to Dr Bob Phillips, Centre for Reviews and Dissemination, University of York, York YO10 5DD, UK; bob.phillips{at}doctors.org.uk

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Propensity scores

Propensity scores are used mainly in observational studies assessing treatments as a way of balancing out measured variations in who received a treatment and who didn't.

In most observational studies, there are things which will have pushed the doc into prescribing the medicine in question, or the surgeon to take the knife to that patient and not the other one. These factors (baseline characteristics, …

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