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. Author manuscript; available in PMC: 2021 Jul 21.
Published in final edited form as: J Best Pract Health Prof Divers. 2016 Spring;9(1):1160–1177.

Table 6.

Evidence Grading (Beach et al., 2005)

Grade Quality Criteria Quantity Criteria Consistency Criteria
A At least 1 RCT At least 1 RCT At least 1 RCT
B At least 75 percent used an objective assessment method At least 75 percent used an objective assessment method At least 75 percent used an objective assessment method
C No controlled trial; at least 50 percent used an objective assessment method At least 2 studies Inconsistent
D No controlled trial; less than 50 percent used an objective assessment method At least 1 study Not enough studies to determine