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GRADE guidelines: 5. Rating the quality of evidence-publication bias

Guyatt, Gordon H. and Oxman, Andrew D. and Montori, Victor and Vist, Gunn and Kunz, Regina and Brozek, Jan and Alonso-Coello, Pablo and Djulbegovic, Ben and Atkins, David and Falck-Ytter, Yngve and Williams, John W. and Meerpohl, Joerg and Norris, Susan L. and Akl, Elie A. and Schünemann, Holger J.. (2011) GRADE guidelines: 5. Rating the quality of evidence-publication bias. Journal of clinical epidemiology, Vol. 64, H. 12. pp. 1277-1282.

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Official URL: http://edoc.unibas.ch/dok/A6004113

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Abstract

In the GRADE approach, randomized trials start as high-quality evidence and observational studies as low-quality evidence, but both can be rated down if a body of evidence is associated with a high risk of publication bias. Even when individual studies included in best-evidence summaries have a low risk of bias, publication bias can result in substantial overestimates of effect. Authors should suspect publication bias when available evidence comes from a number of small studies, most of which have been commercially funded. A number of approaches based on examination of the pattern of data are available to help assess publication bias. The most popular of these is the funnel plot; all, however, have substantial limitations. Publication bias is likely frequent, and caution in the face of early results, particularly with small sample size and number of events, is warranted.
Faculties and Departments:03 Faculty of Medicine > Bereich Medizinische Fächer (Klinik) > Versicherungsmedizin > Versicherungsmedizin (Kunz)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Medizinische Fächer (Klinik) > Versicherungsmedizin > Versicherungsmedizin (Kunz)
UniBasel Contributors:Kunz, Regina
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Pergamon Press
ISSN:0895-4356
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:06 Dec 2013 09:36
Deposited On:06 Dec 2013 09:36

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