Table 1.

Strength of recommendations

Criterion	Definition	Suggestion
Class I	Benefit >> risk	Procedure/treatment should be performed.
	Procedure or treatment is beneficial, useful, and effective.	Is recommended/is indicated
Class IIa	Benefit>risk	It is reasonable to perform this procedure/treatment.
	Evidence or opinion is useful or efficacious.	Should be considered
Class IIb	Benefit≥risk	Procedure/treatment may be considered.
	Additional studies should be conducted to address broad objectives because usefulness/efficacy is well established to a lesser extent.
Class III	Benefit≤risk	Procedure/treatment should not be performed.
	Procedure or treatment is not useful or is potentially harmful	Is not recommended