Strength of Recommendation Grade: A
Consistent, good-quality patient-oriented evidence
Strength of Recommendation Grade: B
Inconsistent or limited-quality patient-oriented evidence
Strength of Recommendation Grade: C
Consensus, disease-oriented evidence, usual practice, expert opinion, or case series
Strength of recommendation taxonomy (SORT) is a grading system used by the American Academy of Family Physicians (AAFP), http://www.aafp.org/afpsort.xml.