The Cochrane Database of Systematic Reviews (CDSR) is the leading resource for systematic reviews in health care. The CDSR includes Cochrane Reviews (the systematic reviews) and protocols for Cochrane Reviews as well as editorials. The CDSR also has occasional supplements.
Cochrane Reviews are full-text systematic reviews which provide an overview of the effects of interventions in health care. The reviews are highly structured. Evidence from clinical trials is included on the basis of explicit quality criteria, thus minimising bias. Each review covers a specific and well-defined area of health care. Data from reviews are often combined statistically to increase the power of the findings of numerous studies, which on their own may be too small to produce reliable results. In such cases, the review may also include graphs presenting data from each individual study.
Cochrane Protocols provide information about reviews which are in progress. They summarise the background, the rationale and proposed methods of the review, and are published in the hope that people will comment on the plans and identify omissions or mistakes before the review is completed.