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jma -> Re: Sackett's levels of evidence (January 21, 2007 3:37:00 PM)
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"The levels of evidence outline by Sackett and his colleagues in 2000 are as follows2:
1A = Systematic Review of Randomized Controlled Trials (RCTs) 1B = RCTs with Narrow Confidence Interval 1C = All or None Case Series 2A = Systematic Review Cohort Studies 2B = Cohort Study/Low Quality RCT 2C = Outcomes Research 3A = Systematic Review of Case-Controlled Studies 3B = Case-controlled Study 4 = Case Series, Poor Cohort Case Controlled 5 = Expert Opinion"
ThIS information was taken from a PDF file,found at, http://www.womenshealthapta.org/pdfs/SOWH-levelsofevidence.pdf
The reference was from the following source:
Sackett DL, Strauss SE, Richardson WS, et al. Evidence-Based Medicine: How to Practice and Teach EBM. Philadelphia, Pa: Churchill-Livingstone; 2000.
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