Evidence Grades

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.