Grades of recommendations
Requires at least one randomised controlled trial
as part of a body of literature of overall good
quality and consistency addressing the specific
recommendation. (Evidence levels Ia, Ib)
Requires the availability of well controlled clinical
studies but no randomised clinical trials on the
topic of recommendations. (Evidence levels IIa,
IIb, III)
Requires evidence obtained from expert
committee reports or opinions and/or clinical
experiences of respected authorities. Indicates an
absence of directly applicable clinical studies of
good quality. (Evidence level IV)
Good practice point
Recommended best practice based on the clinical
experience of the guideline development group