Identifying observational studies of surgical interventions in MEDLINE and EMBASE.

TitleIdentifying observational studies of surgical interventions in MEDLINE and EMBASE.
Publication TypeJournal Article
Year of Publication2006
AuthorsFraser C, Murray A, Burr J
JournalBMC medical research methodology
Date Published2006
KeywordsDatabases, Bibliographic; Efficiency; Evidence-Based Medicine; Humans; Information Storage and Retrieval; MEDLINE; Quality Control; Sensitivity and Specificity; Surgical Procedures, Operative; Technology Assessment, Biomedical

BACKGROUND: Health technology assessments of surgical interventions frequently require the inclusion of non-randomised evidence. Literature search strategies employed to identify this evidence often exclude a methodological component because of uncertainty surrounding the use of appropriate search terms. This can result in the retrieval of a large number of irrelevant records. Methodological filters would help to minimise this, making literature searching more efficient.

METHODS: An objective approach was employed to develop MEDLINE and EMBASE filters, using a reference standard derived from screening the results of an electronic literature search that contained only subject-related terms. Candidate terms for MEDLINE (N = 37) and EMBASE (N = 35) were derived from examination of the records of the reference standard. The filters were validated on two sets of studies that had been included in previous health technology assessments.

RESULTS: The final filters were highly sensitive (MEDLINE 99.5%, EMBASE 100%, MEDLINE/EMBASE combined 100%) with precision ranging between 16.7%-21.1%, specificity 35.3%-43.5%, and a reduction in retrievals of over 30%. Against the validation standards, the individual filters retrieved 85.2%-100% of records. In combination, however, the MEDLINE and EMBASE filters retrieved 100% against both validation standards with a reduction in retrieved records of 28.4% and 30.1%

CONCLUSION: The MEDLINE and EMBASE filters were highly sensitive and substantially reduced the number of records retrieved, indicating that they are useful tools for efficient literature searching.

Alternate JournalBMC Med Res Methodol