Register of trials

Our register has been developed since 1994 and the Information Specialist maintains it periodically through:

  • Systematic searches of major databases,
  • Email alerts for update searches,
  • Searching for grey literature,
  • Hand-searching of journals and conference proceedings,
  • Checking references of relevant papers and their citations, and
  • Contacting the researchers, organisations and companies.

This register contains 25,209 reports for 18,094 coded studies (March 16, 2018).

All reports of controlled trials relevant to the scope of this group (whether randomisation is described or implied) are acquired, coded and included into our Study-Based Register. This register therefore contains some quasi-random studies and trials that do not make the allocation procedure explicit. Currently it also contains non-clinical studies where physiological outcomes are recorded in preference to clinical measures. It does not contain studies where before and after or single-group design has been used.

The register is maintained using MeerKat 1.6 which stores references as studies and it gets updated on daily basis. The group also uses the Cochrane Register of Studies (CRS) to deliver some records to the Cochrane Central Register of Controlled Trials (CENTRAL). Because of copyrighted materials and lack of technological support in CRS for some of languages such as Chinese language, CENTRAL covers only about 20% of references from our register.

Access to the register by reviewers:

Our register can only be searched by the Information Specialist on behalf of Cochrane Schizophrenia Group authors.

Our list of search strategies is available to download.

If you have any queries about accessing the register please contact Farhad [dot] Shokraneh [at] Nottingham.ac.uk