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Table 3 Criteria of GRADE quality analysis

From: The impact of surgery-first approach on the oral health-related quality of life: a systematic review and meta-analysis

Definitive grade Criteria
Grade A (high value) Randomized clinical study or a prospective study with a well-defined control group; Clear definition of diagnosis and endpoints; Description of diagnostic reliability tests and reproducibility tests; Blinding of outcome assessment.
Grade B (moderate value) Cohort study or retrospective study with a well-defined control group; Clear definition of diagnosis and endpoints; Description of diagnostic reliability tests and reproducibility tests.
Grade C (low value) Large attrition; Unclear definition of diagnosis and endpoints; Ill-defined patient material.