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Table 1 The system of evidence level criteria

From: The gut microbiota profile of adults with kidney disease and kidney stones: a systematic review of the literature

Grading Criteria
Strong Consistent findings (≥75%) in at least 2 high-quality studies
Moderate Consistent findings (≥75%) in one high-quality study and at least one low-quality study
Weak Findings of one high-quality study or consistent findings (≥75%) in at least 3 or more low-quality studies
Inconclusive Inconsistent findings, or consistent findings (≥75%) reported in less than 3 low-quality studies