title: Consistency and accuracy of indexing systematic review articles and meta-analyses in medline.
abstract: BACKGROUND
  Systematic review articles support the advance of science and translation of research evidence into healthcare practice. Inaccurate retrieval from medline could limit access to reviews.
  
  
  OBJECTIVE
  To determine the quality of indexing systematic reviews and meta-analyses in medline.
  
  
  METHODS
  The Clinical Hedges Database, containing the results of a hand search of 161 journals, was used to test medline indexing terms for their ability to retrieve systematic reviews that met predefined methodologic criteria (labelled as 'pass' review articles) and reviews that reported a meta-analysis.
  
  
  RESULTS
  The Clinical Hedges Database contained 49 028 articles; 753 were 'pass' review articles (552 with a meta-analysis). In total 758 review articles (independent of whether they passed) reported a meta-analysis. The search strategy that retrieved the highest number of 'pass' systematic reviews achieved a sensitivity of 97.1%. The publication type 'meta analysis' had a false positive rate of 5.6% (95% CI 3.9 to 7.6), and false negative rate of 0.31% (95% CI 0.26 to 0.36) for retrieving systematic reviews that reported a meta-analysis.
  
  
  CONCLUSIONS
  Inaccuracies in indexing systematic reviews and meta-analyses in medline can be partly overcome by a 5-term search strategy. Introducing a publication type for systematic reviews of the literature could improve retrieval performance.
authors.affiliation: McMaster University, Hamilton, Ontario, Canada. wilczyn@mcmaster.ca
authors.forename: Nancy L
authors.initials: NL
authors.lastname: Wilczynski
authors.forename: R Brian
authors.initials: RB
authors.lastname: Haynes
mesh_terms: D000043:Abstracting and Indexing; D019317:Evidence-Based Medicine; D006801:Humans; D016247:Information Storage and Retrieval / Q000379:methods*; D015201:Meta-Analysis as Topic; D012196:Review Literature as Topic; D012680:Sensitivity and Specificity; D013358:Subject Headings