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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.