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Table 1 Categories for strength of each recommendation

From: APSIC guide for prevention of Central Line Associated Bloodstream Infections (CLABSI)

Categories for strength of each recommendation
Category Definition
A Good evidence to support a recommendation for use.
B Moderate evidence to support a recommendation for use.
C Insufficient evidence to support a recommendation for or against use
D Moderate evidence to support a recommendation against use.
E Good evidence to support a recommendation against use.
Categories for quality of evidence on which recommendations are made
Grade Definition
I Evidence from at least one properly randomized, controlled trial.
II Evidence from at least one well-designed clinical trial without randomization, from cohort or case-controlled analytic studies, preferably from more than one centre, from multiple time series, or from dramatic results in uncontrolled experiments.
III Evidence from opinions of respected authorities on the basis of clinical experience, descriptive studies, or reports of expert committees.