Table 2.

Japan Abdominal Emergency Society Grading System for ranking the recommendations in the clinical Guidelines

Grade of recommendation	Definition
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 inconveniences (toxicity, interaction between drugs and cost)
D	Moderate evidence to support a recommendation against use
E	Good evidence to support a recommendation against use