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      New evidence pyramid

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          Abstract

          A pyramid has expressed the idea of hierarchy of medical evidence for so long, that not all evidence is the same. Systematic reviews and meta-analyses have been placed at the top of this pyramid for several good reasons. However, there are several counterarguments to this placement. We suggest another way of looking at the evidence-based medicine pyramid and explain how systematic reviews and meta-analyses are tools for consuming evidence—that is, appraising, synthesising and applying evidence.

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          How to read a systematic review and meta-analysis and apply the results to patient care: users' guides to the medical literature.

          Clinical decisions should be based on the totality of the best evidence and not the results of individual studies. When clinicians apply the results of a systematic review or meta-analysis to patient care, they should start by evaluating the credibility of the methods of the systematic review, ie, the extent to which these methods have likely protected against misleading results. Credibility depends on whether the review addressed a sensible clinical question; included an exhaustive literature search; demonstrated reproducibility of the selection and assessment of studies; and presented results in a useful manner. For reviews that are sufficiently credible, clinicians must decide on the degree of confidence in the estimates that the evidence warrants (quality of evidence). Confidence depends on the risk of bias in the body of evidence; the precision and consistency of the results; whether the results directly apply to the patient of interest; and the likelihood of reporting bias. Shared decision making requires understanding of the estimates of magnitude of beneficial and harmful effects, and confidence in those estimates.
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            Association between analytic strategy and estimates of treatment outcomes in meta-analyses.

            A persistent dilemma when performing meta-analyses is whether all available trials should be included in the meta-analysis.
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              Meta-analysis as evidence: building a better pyramid.

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                Author and article information

                Journal
                Evid Based Med
                Evid Based Med
                ebmed
                ebm
                Evidence-Based Medicine
                BMJ Publishing Group (BMA House, Tavistock Square, London, WC1H 9JR )
                1356-5524
                1473-6810
                August 2016
                23 June 2016
                : 21
                : 4
                : 125-127
                Affiliations
                Rochester, Minnesota, USA
                Author notes
                [Correspondence to ]: Dr M Hassan Murad, Evidence-based Practice Center, Mayo Clinic, Rochester, MN 55905, USA; murad.mohammad@ 123456mayo.edu
                Author information
                http://orcid.org/0000-0001-5481-696X
                Article
                ebmed-2016-110401
                10.1136/ebmed-2016-110401
                4975798
                27339128
                4dc6f51e-2ec4-4d30-a134-80f41a641152
                Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

                This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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                1506
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                education & training (see medical education & training),epidemiology,general medicine (see internal medicine)

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