Extending an evidence hierarchy to include topics other than treatment: revising the Australian 'levels of evidence'

  title={Extending an evidence hierarchy to include topics other than treatment: revising the Australian 'levels of evidence'},
  author={Tracy Merlin and Ad{\'e}le R Weston and R. Tooher},
  booktitle={BMC medical research methodology},
BACKGROUND In 1999 a four-level hierarchy of evidence was promoted by the National Health and Medical Research Council in Australia. The primary purpose of this hierarchy was to assist with clinical practice guideline development, although it was co-opted for use in systematic literature reviews and health technology assessments. In this hierarchy interventional study designs were ranked according to the likelihood that bias had been eliminated and thus it was not ideal to assess studies that… CONTINUE READING


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