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Table 1.

Categories of quality of evidence according to GRADE.

A single downgrade (for randomized clinical trials) or upgrade (for non-randomized studies) corresponds to one level change in the ranking.

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Table 1 Expand

Table 2.

Frequencies and percentages of included systematic reviews per journal type and journal impact factors.

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Table 2 Expand

Fig 1.

Systematic review selection flow diagram.

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Table 3.

Frequencies and percentages of overall and per domain GRADE rating for Cochrane and non-Cochrane meta-analyses.

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Table 3 Expand