title: The number needed to retrieve: a practically useful measure of information retrieval?
authors.forename: Andrew
authors.initials: A
authors.lastname: Booth
mesh_terms: D035843:Biomedical Research; D016206:Databases, Bibliographic / Q000706:statistics & numerical data; D019317:Evidence-Based Medicine; D006801:Humans; D016247:Information Storage and Retrieval / Q000379:methods*; D016245:Librarians; D007993:Libraries, Medical; D007999:Library Services / Q000706:statistics & numerical data; D012196:Review Literature as Topic