Fig 1.
Evidence search and selection.
Table 1.
Description of included umbrella reviews.
Fig 2.
Percent used of methodological approaches for certainty and methodological quality assessment.
(A) Methodological approaches for certainty of evidence assessment. (B) Methodological approaches for methodological quality assessment.
Fig 3.
The proportion of studies employing certainty and methodological quality assessment over time.
Table 2.
Certainty and methodological quality assessment in included URs.
Table 3.
Details of the criteria of credibility assessment used in umbrella reviews published in the top-100 ranking journals*.