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Table 3 Grading system for ranking recommendations in clinical guidelines

From: Bologna Guidelines for Diagnosis and Management of Adhesive Small Bowel Obstruction (ASBO): 2010 Evidence-Based Guidelines of the World Society of Emergency Surgery

Grade of recommendation  
A Good evidence to support a recommendation for use
B Moderate evidence to support a recommendation for use
C Poor evidence to support a recommendation, or the effect may not exceed the adverse effects and/or inconvenience (toxicity, interaction between drugs and cost)
D Moderate evidence to support a recommendation against use
E Good evidence to support a recommendation against use