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Table 1 Characteristics of methods studies on overlapping primary study data across reviews

From: Managing overlap of primary study results across systematic reviews: practical considerations for authors of overviews of reviews

Author Year Title Type of study Method Objective
Descriptive studies
    Ballard 2017 [29] Risk of bias in overviews of reviews: a scoping review of methodological guidance and four-item checklist Article describing methods for overviews of systematic reviews of interventions Scoping review of guidance and methods Synthesise guidance on overview practice
    Bougioukas 2020 [33] Methods for depicting overlap in overviews of systematic reviews: An introduction to static tabular and graphical displays Article describing methods for overviews of systematic reviews of interventions Selective review of papers presenting graphs Present graphs for visually presenting overlap
    Hennessy 2019 [30] Best practice guidelines and essential methodological steps to conduct rigorous and systematic meta-reviews Article describing methods for overviews of systematic reviews of interventions Literature review of methods Described six steps to address challenges in overviews
    Hennessey 2020 [17] Examining overlap of included studies in meta-reviews: guidance for using the corrected covered area index Article describing methods for overviews of systematic reviews of interventions Elaboration of an established method Described five steps when examining overlap, illustrated through an example
    Pollock A. 2017 [18] Selecting and implementing overview methods: implications from five exemplar overviews Article examining methods used in a cross-section or cohort of overviews Elaboration of an established method Describes methodological challenges of five overviews
    Pollock M. 2019 [28] Chapter V: Overviews of reviews. In Cochrane Handbook for Systematic Reviews of Interventions v 6.0 Guidance for undertaking overviews Guidance document Guidance on how and when to assess overlap across primary studies
    Pollock M. 2019 [31] A decision tool to help researchers make decisions about including systematic reviews in overviews of reviews of healthcare interventions Guidance for undertaking overviews Decision tool Systematically conducted seven overviews five times each, making five different decisions about which systematic reviews to include
    Pérez-Bracchiglione 2019 [32] Graphical representation of overlap degree of primary studies in systematic reviews in overviews [abstract OS29.1] Articles describing methods for overviews of systematic reviews of interventions Elaboration of an established method Outlines an overlap assessment tool based on the corrected covered area (CCA [13])
Empirical study
    Pollock M. 2019 [19] The impact of different inclusion decisions on the comprehensiveness and complexity of overviews of reviews of healthcare interventions Empirical study Empirical study of an established method Assessed the impact of five inclusion decisions on the outcome data lost and changed