Grey literature in meta-analyses of randomized trials of health care interventions.

By Sally Hopewell, S. McDonald, Mike J Clarke, Mathias M Egger. Cochrane Database of Systematic Reviews, 2007

614 citations recorded by the source corpus.

Subfields: Management Information Systems, Management Science and Operations Research, Statistics and Probability

View Paper: https://www.semanticscholar.org/paper/feebe97b127dcbc71db74843227151a3952de374

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In Management Information Systems

Julian P. T. Higgins

In Management Science and Operations Research

In Statistics and Probability

Citations in the corpus

Applying systematic review search methods to the grey literature: a case study examining guidelines for school-based breakfast programs in Canada (2015, background): “For reviews of intervention studies, failure to include grey literature may artificially amplify estimates of treatment effects, given the effects of publication bias [5].”
Searching for grey literature for systematic reviews: challenges and benefits (2014, background): “Including grey literature can broaden the scope of the review to more relevant studies, thereby providing a more complete view of all available evidence (Blackhall, 2007; Hammerstrøm et al., 2010; Hopewell et al., 2007; McAuley et al., 2000; Rothstein and Hopewell, 2009).”
The Impact of Peer Assessment on Academic Performance: A Meta-analysis of Control Group Studies (2018, background): “…the inclusion of unpublished data and conference abstracts, i.e., ‘grey literature’ (Cook et al. 1993), we opted to include it in the first instance because including only published studies can result in a metaanalysis over-estimating effect sizes due to publication bias (Hopewell et al. 2007).”
GRADE guidelines: 5. Rating the quality of evidence--publication bias. (2011, background): “Negative studies may be published in some form (theses, book chapters, compendia of meeting abstract submissionsdsometimes referred to as ‘‘gray literature’’) that tend to be omitted from systematic reviews without comprehensive searching [11].”
Physical activity for cancer survivors: meta-analysis of randomised controlled trials (2012, background): “In addition, unpublished studies, such as abstracts or reports, often report smaller treatment effects, 48 are often of poor quality, and do not provide sufficient data for statistical synthesis.”
Scholarship, Research, and Creative Work at Bryn Mawr College Scholarship, Research, and Creative Work at Bryn Mawr College (background): “Even the "faults," such as they are, are common to the majority of survey books on Greek sculp-ture, and therefore not specifically imputable to this particular author, who often tries to express original ideas and positions of his own.”
Application of systematic review methodology to food and feed safety assessments to support decision making. (2010, neutral): “In the biomedical literature, there is evidence for a wide range of publication biases (Hopewell et al., 2007a; Hopewell et al., 2007b; Hopewell et al., 2009).”