Cochrane Central Register of Controlled Trials, also known as Cochrane Controlled Trials Register (CCTR), and sometimes as CENTRAL, is the Cochrane Collaboration's register of controlled trials. The register provides bibliographic information (i.e. abstracts rather than full-text) on over 530,000 reports of trials identified by contributors to the Cochrane Collaboration. Trials are identified from multiple sources, including searches of bibliographic databases, handsearches of many hundreds of journals and conference proceedings, and searches of other trial registers.
Contributors to the Cochrane Collaboration follow quality control standards to ensure that only reports of definite randomized controlled trials or controlled clinical trials are included.
CCTR is also available via the Cochrane Library, but is available here as an Ovid database, using the Ovid search and browse interface.