PDQ-Evidence is a database that facilitates rapid access to the best available evidence for decisions about health systems and population health. It includes systematic reviews, overviews of reviews (including evidence-based policy briefs) and primary studies included in systematic reviews; primary studies included in those; and structured summaries.

The connections between the documents make PDQ-Evidence very easy and quick to search.

For example, each systematic review is linked to all of the studies included in the review, to overviews and policy briefs that include the review, and to other systematic reviews that include any of the same studies.