AHRQ Critical Appraisal and Grading of Evidence
Grading system used by AHRQ-Ottawa:
Basic Jadad score is assessed based on the answer to five questions listed below. Questions that are answered with a “yes” gain 1 point; questions answered with a “no” receive 0 points; the maximum score is 5. A score of 0 to 2 points is considered “low” quality, and a score of 3 to 5 points is considered “high” quality.
Was the study described as random?
Was the randomization scheme described and appropriate?
Was the study described as double-blind?
Was the method of double-blinding appropriate? (Were both the patient and the assessor appropriately blinded?)
Was there a description of dropouts and withdrawals?
Grading system used by AHRQ-Tufts (based on criteria below):
A = highest quality
B = medium quality
C = low quality
SOURCES: Jadad et al., 1996; Cranney et al., 2007; Chung et al., 2009.