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Table 4 Summary across reports of systematic reviews meeting AMSTAR quality assessment criteria (N = 27)

From: Systematic review adherence to methodological or reporting quality

Item assessed Item Description No. of reports reporting adherence by item Adhering SRs Total SRs %
1. Methods: Protocol and registration Was an 'a priori' design provided? 23 820 1794 46
2. Information sources Was the status of publication (i.e. grey literature) used as an inclusion criterion? 23 1013 1794 57
3. Search Was a comprehensive literature search performed? 23 1149 1794 64
4. Data collection process Was there duplicate study selection and data extraction? 23 534 1794 30
5. Results: Study selection Was a list of studies (included and excluded) provided? 22 537 1779 30
6. Study characteristics Were the characteristics of the included studies provided? 23 1439 1794 80
7. Risk of bias within studies Was the scientific quality of the included studies assessed and documented? 23 1200 1794 67
8. Synthesis of results Were the methods used to combine the findings of studies appropriate? 23 1169 1794 65
9. Risk of bias across studies Was the likelihood of publication bias assessed? 23 995 1794 56
10. Limitations Was the scientific quality of the included studies used appropriately in formulating conclusions? 23 590 1794 33
11. Funding Was the conflict of interest stated? 22 685 1779 39