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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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How do we know, in most circumstances, if the drug/potion/puffer, etc, is the cause of something averse?

The basic tenets of appraisal for such a study are about assembling an appropriate group and making fair assessments of outcomes—much as every other type of study.

You would like to see that

  • the exposed and unexposed groups were broadly comparable

  • the outcomes …

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