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Įvidence maps provide a systematic method for mapping the evidence on a particular topic, with the resulting map facilitating identification of gaps in the literature.
MARCH NETWORKS EVIDENCE REVIEWER AVI TRIAL
However, there are unique features of overviews that require the use of different or additional methods, for example, methods for assessing the quality or the risk of bias in systematic reviews dealing with the inclusion of the same trial in multiple systematic reviews dealing with out-of-date systematic reviews and dealing with discordant results across systematic reviews.
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independent study selection and data extraction). In general, the steps for undertaking an overview mirror those of a systematic review, with many of the methods used in systematic reviews being directly transferrable to overviews (e.g. To date, there has been no systematic review or evidence map examining the range of methods for overviews (particularly those which are unique to overviews) nor of the evidence for using these methods. Methods for conducting, interpreting and reporting overviews are in their infancy. The number of published overviews of systematic reviews (henceforth termed overviews) has increased steadily in recent years, in part due to the proliferation of systematic reviews. Overviews of systematic reviews (or umbrella reviews) attempt to systematically retrieve and summarise the results of multiple systematic reviews into a single document. The results of this process will be useful for mapping of methods for overviews of systematic reviews, informing guidance and identifying and prioritising method research in this field. Evaluations will be described and mapped to the framework of methods identified in stage I. Stage II: Evaluations of the performance of methods will be identified from systematic reviews of methods studies and methods studies. Thematic analysis of the coded data will be used to categorise and describe methods.
MARCH NETWORKS EVIDENCE REVIEWER AVI CODE
Two reviewers will independently code included studies to develop the framework. The identified methods will populate a framework of available methods for conducting an overview. Stage I: Methods used in overviews will be identified from articles describing methods for overviews, methods studies examining a cross section/cohort of overviews, guidance documents and commentaries. These searches will be supplemented by searching reference lists and citation searching. Cochrane Methodology Register, Meth4ReSyn library, AHRQ Effective Health Care Program) to identify eligible studies. For both stages, we plan to search methods collections (e.g.
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The research will be undertaken in two stages. The objectives of the study are to develop and populate a framework of methods that have or may be used in conducting, interpreting and reporting overviews of systematic reviews of interventions (stage I) create an evidence map of studies that have evaluated these methods (stage II) and identify and describe unique methodological challenges of overviews. To date, there has been no systematic review or evidence map examining the range of methods for overviews nor of the evidence for using these methods. Methods for conducting, interpreting and reporting overviews of reviews are in their infancy. Overviews of systematic reviews attempt to systematically retrieve and summarise the results of multiple systematic reviews into a single document.