"The intent of this kind of review is to include systematic reviews or meta-analyses as the main study type and thus examine only the highest level of evidence."
"The aim is not to repeat the searches, assess study eligibility, and assess risk of bias from included studies but rather to provide an overall picture of findings."
Source: Blackwood D (2016)
Overviews of Reviews are used:
Timeframe: Approximately 12 months or less.
Question: A broad or narrow PICO of 1 or more interventions.
Sources and searches: Only locating the highest level of evidence of published or unpublished:
The aim is not to identify any new studies.
Selection: Based upon clear inclusion/exclusion criteria and outcome measures defined a priori.
Appraisal: Critical Appraisal of systematic reviews done by at least two independent reviewers using the appropriate tool.
Synthesis: May need to alter the meta-analyses in the included reviews or re-synthesize the data while extracting and combining the relevant data. A final 'Summary of Evidence' table should be present.
Systematic Review of Systematic Reviews, Umbrella Review, Review of Reviews, Summary of Systematic Reviews, Synthesis of Reviews, Review of Systematic Reviews, Review of Reviews, Review of Meta-analyses, Meta-review, Systematic Meta-review
Adapted with permission from Temple University Libraries. https://guides.temple.edu/systematicreviews