Apologies if this is a very basic question or has already been asked many times before (1st time have used this forum)
I am writing a systematic review as part of a dissertation for intensive care and am struggling to understand the fundamental qualities that make one tool for grading evidence better than another. The main options appear to be between GRADE, SIGN and CEBM all of which seem to be well respected and all of which separate level of evidence to grade of recommendation. Beyond that I cannot see any major differences. I have been using SIGN but for the purpose of having a viva on this topic and for future reference feel that should no more detail as to the relative merits of each.
If anyone could offer any advice, would be greatly appreciated
Steve Mathieu
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