Cochrane review literature search

Once optimal recall is achieved, macros are used to translate the search syntaxes between databases, though manual adaptation of the thesaurus terms is still necessary.

cochrane handbook

However, to estimate true recall one need to know the total amount of relevant records in a database, which is not an easy if not impossible task. Because of this major limitation, the question of which databases are necessary to retrieve all relevant references for a systematic review remains unanswered.

Databases were ranked in descending order according to how many SRs that had searched the database.

Literature search process

From the published journal article, we extracted the list of final included references. It is possible for a team to run some or all of their own searches as long as they have the help of a local information specialist who has experience of systematic reviews. There are disadvantages to using multiple databases. One post-hoc sensitivity analysis was conducted to address to what extend the inclusion of SRs with a cut-off of three included RCTs instead of five would affect the result. The researchers that requested the search received a deduplicated EndNote file from which they selected the references relevant for inclusion in their systematic review. These values were calculated both for all reviews combined and per individual review. Margaret can be contacted for advice at any stage m. Table 1 Definitions of general measures of performance in searches Recall. All searches in this study were developed and executed by W. A recent paper tried to find an acceptable number needed to read for adding an additional database; sadly, however, no true conclusion could be drawn [ 20 ]. Associated Data The datasets analysed during the current study are available from the corresponding author on reasonable request.

However, when doing a high quality search two main questions arise; which databases is necessary to searched, and how many? The complete results from all databases used for each of the systematic reviews were imported into a unique EndNote library upon search completion and saved without deduplication for this research.

Cochrane review literature search

Are included references being missed because the review authors failed to search a certain database? For each published systematic review, we extracted the references of the included studies.

Nine for being withdrawn and one for being an overview of reviews.

developing a search strategy for systematic review

Margaret can be contacted for advice at any stage m. Results Eligible databases and systematic reviews A timeline is displayed in Fig.

Cochrane review organization

The complete results from all databases used for each of the systematic reviews were imported into a unique EndNote library upon search completion and saved without deduplication for this research. All searches in this study were developed and executed by W. To identify whether our searches had found the included references, and if so, from which database s that citation was retrieved, each included reference was located in the original corresponding EndNote library using the first author name combined with the publication year as a search term for each specific relevant publication. Keywords: Information retrieval, Bibliometric, MECIR guidelines, Evidence-based medicine, Relative recall, Literature searching, Systematic review, Musculoskeletal area Background Systematic reviews SR and meta-analyses MA are key elements in both evidence-based healthcare [ 1 ] and evidence-based research [ 2 ] By synthesizing the available evidence, SRs support clinicians in making well-informed decisions about health care [ 3 ] and researchers in deciding which topics are the most relevant for new research [ 4 ]. Review projects at Erasmus MC cover a wide range of medical topics, from therapeutic effectiveness and diagnostic accuracy to ethics and public health. Review teams should try at least to provide key search terms and synonyms when they first submit their protocol. We selected the domain from a pre-defined set of broad domains, including therapy, etiology, epidemiology, diagnosis, management, and prognosis. SRs were excluded if they: i did not include at least five randomised controlled trials RCT , as the consequence of missing one study in reviews with few studies included would affect the overall percentage more than with a higher total of included studies. From the published journal article, we extracted the list of final included references.
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Effective literature searching