{"id":858,"date":"2026-06-15T04:34:07","date_gmt":"2026-06-15T04:34:07","guid":{"rendered":"https:\/\/www.editage.com\/blog\/?p=858"},"modified":"2026-09-03T21:35:40","modified_gmt":"2026-09-03T16:05:40","slug":"umbrella-review","status":"publish","type":"post","link":"https:\/\/www.editage.com\/blog\/umbrella-review\/","title":{"rendered":"What Is an Umbrella Review? Definition, Methods, Tools, Examples"},"content":{"rendered":"\r\n<p>\r\n\r\n<\/p>\r\n<ul>\r\n<li>An umbrella review is a systematic review of systematic reviews and\/or meta-analyses (SRMAs); it synthesizes evidence at the highest available level, one step above individual SRMAs in the evidence hierarchy.<\/li>\r\n<li>It is also called an &#8216;overview of reviews,&#8217; &#8216;meta-review,&#8217; or &#8216;review of reviews&#8217;. These terms are largely interchangeable in the current literature, though Cochrane prefers &#8216;overview of reviews.&#8217;<\/li>\r\n<li>Umbrella reviews are appropriate only when a research topic is already well-covered by existing SRMAs. They cannot substitute for a primary systematic review where SRMAs do not yet exist.<\/li>\r\n<li>The unit of analysis is the SRMA, not the primary study. But researchers typically re-run each meta-analysis using standardized statistical methods rather than simply reporting the published pooled estimates.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#What_Is_an_Umbrella_Review\" >What Is an Umbrella Review?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Why_Umbrella_Reviews_Exist\" >Why Umbrella Reviews Exist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#When_to_Use_an_Umbrella_Review\" >When to Use an Umbrella Review<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Ideal_Conditions_for_an_Umbrella_Review\" >Ideal Conditions for an Umbrella Review<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#When_NOT_to_Use_an_Umbrella_Review\" >When NOT to Use an Umbrella Review<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Umbrella_Reviews_vs_Other_Review_Types\" >Umbrella Reviews vs. Other Review Types<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Umbrella_Review_vs_Systematic_Review_Key_Differences\" >Umbrella Review vs. Systematic Review: Key Differences<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#The_Evidence_Hierarchy\" >The Evidence Hierarchy<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Registering_an_Umbrella_Review_Prospectively\" >Registering an Umbrella Review Prospectively<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Step_1_Develop_a_Protocol_Before_Starting_Review_Work\" >Step 1: Develop a Protocol Before Starting Review Work<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Step_2_Choose_a_Registry\" >Step 2: Choose a Registry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Step_3_Timing_of_Registration\" >Step 3: Timing of Registration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Step_4_Register_on_PROSPERO\" >Step 4: Register on PROSPERO<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Step_5_Cite_the_Registration\" >Step 5: Cite the Registration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Step_6_Handling_Amendments\" >Step 6: Handling Amendments<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#How_to_Conduct_an_Umbrella_Review_Step-by-Step_Methodology\" >How to Conduct an Umbrella Review: Step-by-Step Methodology<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Confirm_the_Review_Is_Needed_Register_a_Protocol\" >Confirm the Review Is Needed &amp; Register a Protocol<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Define_the_Research_Question_PICOPECO_Framework\" >Define the Research Question (PICO\/PECO Framework)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Develop_Explicit_Eligibility_Criteria\" >Develop Explicit Eligibility Criteria<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Construct_a_Two-Part_Search_Algorithm\" >Construct a Two-Part Search Algorithm<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Screen_Literature_Independently_Double_Screening\" >Screen Literature Independently (Double Screening)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Manage_Overlap_Between_SRMAs\" >Manage Overlap Between SRMAs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Extract_Data_Using_Standardized_Forms\" >Extract Data Using Standardized Forms<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Re-Run_Meta-Analyses_with_Standardized_Methods\" >Re-Run Meta-Analyses with Standardized Methods<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Assess_Methodological_Quality_of_Included_SRMAs\" >Assess Methodological Quality of Included SRMAs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Grade_the_Strength_of_Evidence\" >Grade the Strength of Evidence<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Report_Results_Transparently\" >Report Results Transparently<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Interpret_Findings_Carefully\" >Interpret Findings Carefully<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#What_is_AMSTAR-2\" >What is AMSTAR-2?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Why_AMSTAR-2_Matters_in_Umbrella_Reviews\" >Why AMSTAR-2 Matters in Umbrella Reviews<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Key_Limitation\" >Key Limitation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#What_is_GRADE\" >What is GRADE?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Why_GRADE_Matters_in_Umbrella_Reviews\" >Why GRADE Matters in Umbrella Reviews<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#How_Umbrella_Review_Authors_Apply_GRADE\" >How Umbrella Review Authors Apply GRADE<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#GRADE_vs_AMSTAR-2\" >GRADE vs AMSTAR-2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Key_Limitation-2\" >Key Limitation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Managing_Overlap_of_Primary_Studies_in_Umbrella_Reviews\" >Managing Overlap of Primary Studies in Umbrella Reviews<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Why_Overlap_Matters\" >Why Overlap Matters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Strategies_for_Handling_Overlap\" >Strategies for Handling Overlap<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Important_clarification\" >Important clarification<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Quality_Assessment_Tools_for_Umbrella_Reviews\" >Quality Assessment Tools for Umbrella Reviews<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#AMSTAR-2_Primary_Tool\" >AMSTAR-2 (Primary Tool)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#ROBIS_for_Umbrella_Reviews\" >ROBIS for Umbrella Reviews<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#JBI_Critical_Appraisal_Checklist_for_Umbrella_Reviews\" >JBI Critical Appraisal Checklist for Umbrella Reviews<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#PRISMA_Checklist_for_Umbrella_Reviews\" >PRISMA Checklist for Umbrella Reviews<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Practical_note\" >Practical note<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-47\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Strengths_Limitations_of_Umbrella_Reviews\" >Strengths &amp; Limitations of Umbrella Reviews<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-48\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Strengths\" >Strengths<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-49\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Limitations\" >Limitations<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-50\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-51\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Can_I_do_an_umbrella_review_if_some_of_the_systematic_reviews_I_find_are_low_quality_Do_I_have_to_exclude_them\" >Can I do an umbrella review if some of the systematic reviews I find are low quality? Do I have to exclude them?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-52\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#If_multiple_systematic_reviews_all_include_the_same_studies_isnt_the_%E2%80%98umbrella_review_just_inflating_the_evidence_base_and_showing_me_one_study_multiple_times\" >If multiple systematic reviews all include the same studies, isn&#8217;t the &#8216;umbrella review&#8217; just inflating the evidence base and showing me one study multiple times?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-53\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Do_I_need_a_full_team_to_conduct_an_umbrella_review_or_can_I_do_it_alone_Is_it_really_faster_than_a_systematic_review\" >Do I need a full team to conduct an umbrella review, or can I do it alone? Is it really faster than a systematic review?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-54\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Two_of_the_systematic_reviews_I_want_to_include_reach_completely_opposite_conclusions_on_the_same_question_What_do_I_do\" >Two of the systematic reviews I want to include reach completely opposite conclusions on the same question. What do I do?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-55\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#Can_an_umbrella_review_include_non-intervention_reviews_like_reviews_of_prevalence_diagnostic_accuracy_or_qualitative_studies\" >Can an umbrella review include non-intervention reviews, like reviews of prevalence, diagnostic accuracy, or qualitative studies?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-56\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#When_an_umbrella_review_and_a_single_systematic_review_both_exist_on_the_same_question_which_should_I_cite_in_my_paper_or_guideline\" >When an umbrella review and a single systematic review both exist on the same question, which should I cite in my paper or guideline?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-57\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/#References\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_an_Umbrella_Review\"><\/span><a id=\"_Toc232410201\"><\/a>What Is an Umbrella Review?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p>An umbrella review is a <a href=\"https:\/\/www.editage.com\/blog\/conducting-and-reporting-systematic-reviews\/\">systematic review<\/a> of previously published systematic reviews and\/or meta-analyses. Where a typical systematic review synthesizes primary studies (randomized controlled trials, cohort studies, etc.), an umbrella review sits one level higher: its building blocks are themselves the products of evidence synthesis.<\/p>\r\n\r\n\r\n\r\n<p>The name is apt: an umbrella review holds multiple systematic reviews under a single canopy, offering a panoramic view of an entire research landscape rather than a narrow cross-section of it.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n<p>It is also known by several other names in the literature:<\/p>\r\n\r\n\r\n\r\n<ul>\r\n<li>Overview of reviews (the preferred Cochrane terminology)<\/li>\r\n<li>Review of reviews<\/li>\r\n<li>Meta-review<\/li>\r\n<li>Summaries of systematic reviews<\/li>\r\n<li>Syntheses of reviews<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Why_Umbrella_Reviews_Exist\"><\/span><a id=\"_Toc232410202\"><\/a>Why Umbrella Reviews Exist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p>The exponential growth of biomedical publishing has created a paradox: researchers now have access to more evidence than ever before, yet synthesizing it all is increasingly impossible. As the number of systematic reviews has grown year-on-year, a new level of synthesis became necessary.<\/p>\r\n\r\n\r\n\r\n<ul>\r\n<li>Thousands of systematic reviews are published annually across medicine, psychology, and public health<\/li>\r\n<li>Multiple competing SRMAs often exist on the same narrow question, reaching different conclusions<\/li>\r\n<li>Clinicians, guideline developers, and policymakers need a single, authoritative synthesis and not a reading list of competing reviews<\/li>\r\n<li>Health technology assessments that evaluate all management options for a condition benefit enormously from a single umbrella document<\/li>\r\n<li>A field may have been split into focused populations or interventions across many reviews; an umbrella review restores coherence by bringing them together<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"When_to_Use_an_Umbrella_Review\"><\/span><a id=\"_Toc232410203\"><\/a>When to Use an Umbrella Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p>Not every research question warrants an umbrella review. The method is most appropriate under specific conditions.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Ideal_Conditions_for_an_Umbrella_Review\"><\/span>Ideal Conditions for an Umbrella Review<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>Two or more existing high-quality systematic reviews already exist on the topic<\/li>\r\n<li>The field has been well-covered by SRMAs but lacks an overarching synthesis<\/li>\r\n<li>Multiple competing interventions or exposures exist for a single condition<\/li>\r\n<li>Guideline developers need a broad, defensible evidence base quickly<\/li>\r\n<li>The question is broad enough that a single SR would be unwieldy or uninformative<\/li>\r\n<li>Decision-makers need a rapid orientation to the state of evidence across a complex topic<\/li>\r\n<li>There is confusion or contradiction between existing SRMAs that a higher-level synthesis could clarify<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"When_NOT_to_Use_an_Umbrella_Review\"><\/span>When NOT to Use an Umbrella Review<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>Existing systematic reviews are absent, sparse, or of very low quality<\/li>\r\n<li>The research question is narrow enough that a single SR would suffice<\/li>\r\n<li>The topic area is too new for secondary evidence to exist<\/li>\r\n<li>Subgroup analyses of individual patient data are needed (an umbrella review cannot do this)<\/li>\r\n<li>The goal is to re-analyse primary data; umbrella reviews work only at the review level<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Umbrella_Reviews_vs_Other_Review_Types\"><\/span><a id=\"_Toc232410204\"><\/a>Umbrella Reviews vs. Other Review Types<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<td><strong>Review Type<\/strong><\/td>\r\n<td><strong>Unit of Analysis<\/strong><\/td>\r\n<td><strong>Scope<\/strong><\/td>\r\n<td><strong>Question Type<\/strong><\/td>\r\n<td><strong>Typical Output<\/strong><\/td>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td><strong>Umbrella Review<\/strong><\/td>\r\n<td>Systematic reviews &amp; meta-analyses<\/td>\r\n<td>Very broad<\/td>\r\n<td>Multiple interventions\/exposures\/outcomes<\/td>\r\n<td>Panoramic evidence map; evidence grading<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong><a href=\"https:\/\/www.editage.com\/insights\/a-young-researchers-guide-to-a-systematic-review\">Systematic Review<\/a><\/strong><\/td>\r\n<td>Primary studies (RCTs, cohorts, etc.)<\/td>\r\n<td>Narrow\u2013moderate<\/td>\r\n<td>Specific <a href=\"https:\/\/www.editage.com\/blog\/what-is-the-pico-framework-in-research-definition-uses-examples\/\">PICO<\/a> question<\/td>\r\n<td>Pooled or narrative synthesis<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong><a href=\"https:\/\/www.editage.com\/blog\/meta-analysis\/\">Meta-Analysis<\/a><\/strong><\/td>\r\n<td>Quantitative data from primary studies<\/td>\r\n<td>Narrow<\/td>\r\n<td>One or few outcomes<\/td>\r\n<td>Pooled effect estimate (OR, RR, MD)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong><a href=\"https:\/\/www.editage.com\/blog\/scoping-review\/\">Scoping Review<\/a><\/strong><\/td>\r\n<td>Primary studies (any design)<\/td>\r\n<td>Broad<\/td>\r\n<td>Landscape mapping; concept clarification<\/td>\r\n<td>Map of evidence; research gaps<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong><a href=\"https:\/\/www.editage.com\/blog\/narrative-review-literature-synthesis\/\" target=\"_blank\" rel=\"noreferrer noopener\">Narrative Review<\/a><\/strong><\/td>\r\n<td>Primary studies (selective)<\/td>\r\n<td>Variable<\/td>\r\n<td>Background, educational<\/td>\r\n<td>Expert-guided summary; not reproducible<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><a href=\"https:\/\/www.editage.com\/blog\/rapid-review\/\"><strong>Rapid Review<\/strong><\/a><\/td>\r\n<td>Primary studies or SRs<\/td>\r\n<td>Narrow\u2013moderate<\/td>\r\n<td>Policy-urgent questions<\/td>\r\n<td>Abbreviated synthesis with speed tradeoffs<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><a href=\"https:\/\/www.editage.com\/blog\/realist-review\/\"><strong>Realist Review<\/strong><\/a><\/td>\r\n<td>Primary studies<\/td>\r\n<td>Variable<\/td>\r\n<td>What works for whom in what context?<\/td>\r\n<td>Mechanistic explanations; theory-building<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Umbrella_Review_vs_Systematic_Review_Key_Differences\"><\/span><a id=\"_Toc232410205\"><\/a>Umbrella Review vs. Systematic Review: Key Differences<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<td><strong>Dimension<\/strong><\/td>\r\n<td><strong>Systematic Review<\/strong><\/td>\r\n<td><strong>Umbrella Review<\/strong><\/td>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Building block<\/td>\r\n<td>Primary study<\/td>\r\n<td>Systematic review or meta-analysis<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Eligibility criteria<\/td>\r\n<td>Focused and specific<\/td>\r\n<td>Broader, but still pre-specified<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Search terms<\/td>\r\n<td>Disease\/intervention keywords<\/td>\r\n<td>Disease\/topic + systematic review OR meta-analysis<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Quality appraisal tool<\/td>\r\n<td>Cochrane RoB, ROBINS-I, NOS, etc.<\/td>\r\n<td>AMSTAR-2, ROBIS, JBI checklist<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Statistical re-analysis<\/td>\r\n<td>Meta-analysis of primary data<\/td>\r\n<td>Re-run existing meta-analyses using standardized methods<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Time to complete<\/td>\r\n<td>12\u201324 months (typical)<\/td>\r\n<td>6\u201310 weeks (professional teams)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Overlap concern<\/td>\r\n<td>Duplicate data in pooled analyses<\/td>\r\n<td>Same primary studies across multiple SRs (use CCA)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Evidence hierarchy position<\/td>\r\n<td>High<\/td>\r\n<td>Highest currently available<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"The_Evidence_Hierarchy\"><\/span><a id=\"_Toc232410206\"><\/a>The Evidence Hierarchy<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p>Umbrella reviews sit at the apex of the evidence pyramid. Understanding where they stand relative to other study designs clarifies their unique value.<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Umbrella Reviews<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Systematic Reviews &amp; Meta-Analyses<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Randomized Controlled Trials (RCTs)<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Cohort &amp; Prospective Studies<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Case-Control &amp; Cross-Sectional Studies<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Case Reports &amp; Case Series<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Expert Opinion &amp; Editorials<\/strong><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p>Umbrella reviews represent one of the highest levels of evidence synthesis currently available. They do not directly include primary studies; instead, they synthesize the work of dozens or hundreds of individual systematic reviews. This means that their conclusions rest on a very broad base of underlying research.<\/p>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Registering_an_Umbrella_Review_Prospectively\"><\/span><a id=\"_Toc232410207\"><\/a>Registering an Umbrella Review Prospectively<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Step_1_Develop_a_Protocol_Before_Starting_Review_Work\"><\/span>Step 1: Develop a Protocol Before Starting Review Work<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>A protocol should be finalized <strong>before study selection\/screening begins<\/strong> (and at minimum, before data extraction starts). It typically includes:<\/p>\r\n\r\n\r\n\r\n<ul>\r\n<li>Research question(s) in PICO\/PECO format<\/li>\r\n<li>Eligibility criteria for systematic reviews to be included<\/li>\r\n<li>Search strategy and databases<\/li>\r\n<li>Quality appraisal tool(s) (e.g., AMSTAR-2, ROBIS, JBI)<\/li>\r\n<li>Data extraction and synthesis plan<\/li>\r\n<li>Handling of overlapping primary studies across reviews<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Step_2_Choose_a_Registry\"><\/span>Step 2: Choose a Registry<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<td><strong>Registry<\/strong><\/td>\r\n<td><strong>Cost<\/strong><\/td>\r\n<td><strong>Notes<\/strong><\/td>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td><strong>PROSPERO<\/strong> (CRD, University of York)<\/td>\r\n<td>Free<\/td>\r\n<td>Eligible review types include systematic, rapid, umbrella, diagnostic accuracy, prognostic, and methodological reviews; <a href=\"https:\/\/researchgold.org\/blog\/what-is-prospero\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0<\/a>\u00a0scoping reviews are not eligible<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>OSF (Open Science Framework)<\/strong><\/td>\r\n<td>Free<\/td>\r\n<td>Common alternative, especially for non-PROSPERO-eligible designs<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>INPLASY<\/strong><\/td>\r\n<td>Paid<\/td>\r\n<td>Faster turnaround, broader eligibility<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Research Registry<\/strong><\/td>\r\n<td>Paid<\/td>\r\n<td>Alternative option<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>JBI Systematic Review Register<\/strong><\/td>\r\n<td>Free (JBI members)<\/td>\r\n<td>Title registry for JBI-affiliated reviews only<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p>PROSPERO is the most widely recognized and commonly used registry for umbrella reviews in health research.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Step_3_Timing_of_Registration\"><\/span>Step 3: Timing of Registration<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>Registration should take place once the review protocol has been finalised, but ideally before screening studies for inclusion begins. <a href=\"https:\/\/libguides.usc.edu\/systematicreviews_ssci\/prep\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0<\/a><\/li>\r\n<li>Reviews are accepted for registration as long as they have not progressed beyond completion of data extraction. <a href=\"https:\/\/libguides.usc.edu\/systematicreviews_ssci\/prep\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0<\/a><\/li>\r\n<li>Completed reviews are not accepted. Registration must occur <em>before<\/em> the review is finished. <a href=\"https:\/\/researchgold.org\/blog\/what-is-prospero\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0<\/a><\/li>\r\n<li>Registration must occur before data extraction begins; earlier is better and more credible for accountability purposes. <a href=\"https:\/\/researchgold.org\/blog\/what-is-prospero\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0<\/a><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Step_4_Register_on_PROSPERO\"><\/span>Step 4: Register on PROSPERO<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ol type=\"1\">\r\n<li>Go to the PROSPERO website (CRD, University of York)<\/li>\r\n<li>Create an account<\/li>\r\n<li>Complete the online registration form, including:\r\n<ul>\r\n<li>Review title and team details<\/li>\r\n<li>Anticipated start\/completion dates<\/li>\r\n<li>Condition\/domain being studied<\/li>\r\n<li>Comparator\/exposure and outcomes<\/li>\r\n<li>Search strategy summary<\/li>\r\n<li>Quality appraisal tool(s) to be used<\/li>\r\n<\/ul>\r\n<\/li>\r\n<li>Submit for review by PROSPERO administrators<\/li>\r\n<li>Receive a <strong>unique CRD registration number<\/strong> (format: CRD4YYYYxxxxxx)<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Step_5_Cite_the_Registration\"><\/span>Step 5: Cite the Registration<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>A unique CRD identifier issued at approval is used by journals, peer reviewers, and funders to verify the published review matches the registered plan. <a href=\"https:\/\/researchgold.org\/blog\/what-is-prospero\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0<\/a><\/li>\r\n<li>Include the registration number in:\r\n<ul>\r\n<li>The protocol publication (if published separately)<\/li>\r\n<li>The final manuscript&#8217;s abstract and methods section<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Step_6_Handling_Amendments\"><\/span>Step 6: Handling Amendments<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>Amendments are dated and version-tracked. <a href=\"https:\/\/researchgold.org\/blog\/what-is-prospero\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0<\/a><\/li>\r\n<li>Deviations from the registered protocol are described in the manuscript&#8217;s methods section. <a href=\"https:\/\/researchgold.org\/blog\/what-is-prospero\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0<\/a><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n\r\n\r\n<p>This is a general informational overview based on current registry guidance; if precise current PROSPERO eligibility criteria are critical to your submission, it&#8217;s worth double-checking directly on the PROSPERO website, as policies can be updated periodically.<\/p>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"How_to_Conduct_an_Umbrella_Review_Step-by-Step_Methodology\"><\/span><a id=\"_Toc232410208\"><\/a>How to Conduct an Umbrella Review: Step-by-Step Methodology<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p>Conducting an umbrella review is a rigorous process. Below are the essential steps, drawn from the leading methodological guidance documents including the JBI Manual, the BMJ Medicine guidelines, and published frameworks from Fusar-Poli &amp; Radua.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Confirm_the_Review_Is_Needed_Register_a_Protocol\"><\/span>Confirm the Review Is Needed &amp; Register a Protocol<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Before beginning, verify that no equivalent umbrella review has already been published or is underway (check PROSPERO and published literature). Pre-specify your protocol and register it on PROSPERO. This prevents selective reporting and establishes transparency. Protocol registration is increasingly required by journals.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Define_the_Research_Question_PICOPECO_Framework\"><\/span>Define the Research Question (PICO\/PECO Framework)<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p><strong>\u00a0<\/strong>Clearly articulate what you are asking. For intervention reviews, use the PICO framework (Population, Intervention, Comparison, Outcome). For epidemiological umbrella reviews, define the population(s), risk factor(s) or exposure(s), and outcome(s). The scope should be broader than a typical SR but still precisely delimited.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Develop_Explicit_Eligibility_Criteria\"><\/span>Develop Explicit Eligibility Criteria<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p><strong>\u00a0<\/strong>Specify which types of SRMAs will be included and excluded. Typical criteria address publication type, language and date restrictions, minimum quality thresholds (or the decision to include all regardless of quality), whether to include SRMAs of observational studies only or RCTs only or both, and the definition of relevant population, intervention\/exposure, and outcomes.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Construct_a_Two-Part_Search_Algorithm\"><\/span>Construct a Two-Part Search Algorithm<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>The search string has two components combined using boolean AND: (1) a study design filter identifying SRMAs (e.g., &#8216;systematic review*&#8217; OR &#8216;meta-analys*&#8217;), and (2) a topic filter covering all relevant keywords, MeSH terms, and synonyms. Search multiple databases (MEDLINE, Embase, Cochrane Library, PsycINFO) and grey literature sources.<\/p>\r\n\r\n\r\n\r\n<p><em>See also: <strong><a href=\"https:\/\/researcher.life\/blog\/article\/how-and-where-to-find-research-papers-for-literature-reviews\/\">How and Where to Find Research Papers for Literature Reviews: Literature Search Strategies and Examples<\/a><\/strong><\/em><\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Screen_Literature_Independently_Double_Screening\"><\/span>Screen Literature Independently (Double Screening)<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Two independent reviewers screen titles and abstracts, then full texts, using the pre-specified eligibility criteria. Disagreements are resolved through discussion or a third reviewer. Document exclusion reasons at the full-text stage and present results in a PRISMA flow diagram.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Manage_Overlap_Between_SRMAs\"><\/span>Manage Overlap Between SRMAs<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>When multiple SRMAs cover the same primary studies and outcomes, decide which to include. Common strategies: choose the most recent SRMA; choose the SRMA with the largest number of studies; choose the SRMA with the highest AMSTAR-2 quality; for epidemiological reviews, choose the SRMA with the most prospective studies. Calculate the Corrected Covered Area (CCA) to quantify overlap.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Extract_Data_Using_Standardized_Forms\"><\/span>Extract Data Using Standardized Forms<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Two reviewers independently extract data. For each included SRMA, extract: number of included studies and total sample size; study-specific effect estimates and 95% confidence intervals; heterogeneity statistics (I\u00b2, Cochran&#8217;s Q, tau\u00b2); any risk-of-bias or quality assessments reported within the SRMA; and descriptive conclusions for narrative reviews without meta-analysis.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Re-Run_Meta-Analyses_with_Standardized_Methods\"><\/span>Re-Run Meta-Analyses with Standardized Methods<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Rather than simply reporting the pooled estimates as published, re-run each meta-analysis using standardized statistical models. This ensures comparability across all included SRMAs. Conduct consistency checks and assess heterogeneity and potential biases (small study effects, excess significance bias) uniformly.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Assess_Methodological_Quality_of_Included_SRMAs\"><\/span>Assess Methodological Quality of Included SRMAs<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Apply validated appraisal tools, most commonly AMSTAR-2, to each included SRMA. Appraisal should be done independently by two reviewers, with consensus discussion for discrepancies. Summarize quality findings in a table.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Grade_the_Strength_of_Evidence\"><\/span>Grade the Strength of Evidence<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>For intervention reviews: apply GRADE. For epidemiological umbrella reviews: use criteria assessing amount of evidence, statistical significance, heterogeneity, small study effects, and excess significance bias. Consider performing sensitivity analyses restricted to prospective studies to examine temporality of associations.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Report_Results_Transparently\"><\/span>Report Results Transparently<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Report in both tabular and graphical formats. Key elements include summary tables of all meta-analyses with key statistics, evidence grading tables, PRISMA flow diagrams, and optional visual plots (forest plots, Manhattan plots). Address contradictory conclusions across SRMAs explicitly.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Interpret_Findings_Carefully\"><\/span>Interpret Findings Carefully<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Interpret with attention to <a href=\"https:\/\/www.editage.com\/blog\/confounding-variables-identification-definition-types-examples\">confounding<\/a> (for observational reviews), clinical relevance, <a href=\"https:\/\/www.editage.com\/blog\/internal-validity-external-validity-definition-differences-examples\/\">external validity<\/a>\/generalizability, and the limitations of the included SRMAs. Causal claims require extreme caution. Discuss biological plausibility and cite supporting evidence from other methodologies (e.g., Mendelian randomisation studies).<\/p>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"What_is_AMSTAR-2\"><\/span><a id=\"_Toc232410209\"><\/a>What is AMSTAR-2?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p><a href=\"https:\/\/www.bmj.com\/content\/358\/bmj.j4008\"><strong>AMSTAR-2<\/strong><\/a> (A MeaSurement Tool to Assess systematic Reviews, version 2) is a 16-item checklist used to evaluate the methodological quality of systematic reviews, including those with or without meta-analysis. In an <strong>umbrella review<\/strong> (a review that synthesizes findings from multiple systematic reviews\/meta-analyses on related topics), AMSTAR-2 is applied to <strong>each included systematic review<\/strong> to judge how trustworthy its conclusions are before they&#8217;re pooled or compared.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Why_AMSTAR-2_Matters_in_Umbrella_Reviews\"><\/span>Why AMSTAR-2 Matters in Umbrella Reviews<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>Umbrella reviews combine evidence from many systematic reviews, often covering overlapping primary studies.<\/li>\r\n<li>The overall conclusions are only as reliable as the weakest review included.<\/li>\r\n<li>AMSTAR-2 helps flag reviews with serious methodological flaws so their findings can be interpreted with appropriate caution or downweighted.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Key_Limitation\"><\/span>Key Limitation<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>AMSTAR-2 assesses <strong>how a review was conducted<\/strong>, not whether its findings are correct. A methodologically strong review can still report null or modest effects, and a flawed one can still report a true effect. It&#8217;s a quality lens, not a validity verdict on the underlying evidence itself.<\/p>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"What_is_GRADE\"><\/span><a id=\"_Toc232410210\"><\/a>What is GRADE?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p><a href=\"https:\/\/www.gradeworkinggroup.org\/\"><strong>GRADE<\/strong> (Grading of Recommendations Assessment, Development and Evaluation)<\/a> is a framework for rating the certainty of evidence for a given outcome and, where applicable, the strength of recommendations. In an umbrella review, GRADE is applied to the body of evidence underlying each outcome reported across the included systematic reviews\/meta-analyses and it helps readers judge how much confidence to place in each summary effect.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Why_GRADE_Matters_in_Umbrella_Reviews\"><\/span>Why GRADE Matters in Umbrella Reviews<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>Umbrella reviews often report many outcome-exposure or outcome-intervention associations.<\/li>\r\n<li>Not all associations are equally trustworthy, even if statistically significant.<\/li>\r\n<li>GRADE provides a standardized way to communicate <em>how confident<\/em> readers should be that the reported effect reflects the true effect.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"How_Umbrella_Review_Authors_Apply_GRADE\"><\/span>How Umbrella Review Authors Apply GRADE<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>Often combined with other classification systems specific to umbrella reviews (e.g., evidence classes based on significance, sample size, and 95% prediction intervals), but GRADE remains the most widely recognized certainty framework.<\/li>\r\n<li>Each outcome\/association is assessed individually, since certainty can vary even within the same umbrella review.<\/li>\r\n<li>Findings are typically presented in a GRADE summary table alongside effect estimates.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"GRADE_vs_AMSTAR-2\"><\/span>GRADE vs AMSTAR-2<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>AMSTAR-2 assesses the methodological quality of each included systematic review (the &#8220;wrapper&#8221;).<\/li>\r\n<li>GRADE assesses the certainty of the evidence for each outcome (the underlying findings).<\/li>\r\n<li>Used together, they give umbrella review readers a fuller picture: <em>was the review conducted well, AND can we trust its reported effect?<\/em><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Key_Limitation-2\"><\/span>Key Limitation<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>GRADE was originally developed for single systematic reviews informing clinical guidelines, so applying it within umbrella reviews requires adaptation. This is particularly relevant when you are summarizing across multiple overlapping reviews with shared primary studies, which can complicate judgments about imprecision and inconsistency.<\/p>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Managing_Overlap_of_Primary_Studies_in_Umbrella_Reviews\"><\/span><a id=\"_Toc232410211\"><\/a>Managing Overlap of Primary Studies in Umbrella Reviews<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p>One of the most technically complex challenges in umbrella reviews is overlap: many systematic reviews on the same topic will have included some or all of the same primary studies. If left unaddressed, overlap can inflate the apparent evidence base and artificially narrow <a href=\"https:\/\/www.editage.com\/blog\/what-is-confidence-intervals-and-why-is-it-important\/\">confidence intervals<\/a>. This would make results look more precise than they actually are.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Why_Overlap_Matters\"><\/span>Why Overlap Matters<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>A single large, high-quality RCT included in five separate meta-analyses may have disproportionate influence on the overall umbrella review finding<\/li>\r\n<li>Overlap that inflates sample sizes can produce misleadingly low <a href=\"https:\/\/www.editage.com\/insights\/correct-way-report-p-values\">p-values<\/a>, increasing Type I error (false positive) risk<\/li>\r\n<li>Contradictory conclusions between SRMAs on the same question may stem from differing eligibility criteria, search dates, or statistical methods<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Strategies_for_Handling_Overlap\"><\/span>Strategies for Handling Overlap<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<td><strong>Strategy<\/strong><\/td>\r\n<td><strong>Description<\/strong><\/td>\r\n<td><strong>Best Used When<\/strong><\/td>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td><strong>Corrected Covered Area (CCA)<\/strong><\/td>\r\n<td>Quantifies the proportion of primary studies shared across SRMAs. CCA &lt;0.05 = slight; 0.05\u20130.10 = moderate; 0.11\u20130.15 = high; &gt;0.15 = very high overlap.<\/td>\r\n<td>Always, as a reporting measure alongside any overlap decisions<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Restrict by recency<\/strong><\/td>\r\n<td>Among overlapping SRMAs, include only the most recently published version<\/td>\r\n<td>When the topic has evolved rapidly and newer SRMAs incorporate more updated evidence<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Restrict by size<\/strong><\/td>\r\n<td>Prefer the SRMA with the most included primary studies<\/td>\r\n<td>When comprehensiveness of coverage is the priority<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Restrict by quality<\/strong><\/td>\r\n<td>Use AMSTAR-2 scores to select the methodologically highest-quality SRMA<\/td>\r\n<td>When methodological rigour is the priority<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Include all + CCA reporting<\/strong><\/td>\r\n<td>Include all SRMAs and quantify overlap using CCA; interpret results in light of the overlap magnitude<\/td>\r\n<td>When comprehensiveness and transparency are prioritized; common in observational umbrella reviews<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Important_clarification\"><\/span>Important clarification<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>An umbrella review does not combine or re-pool results from different meta-analyses in a grand statistical synthesis. It describes and grades the evidence from each SRMA separately. Therefore, overlap does not carry the same statistical risk as in a traditional meta-analysis, but it must still be acknowledged and managed for interpretive clarity.<\/p>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Quality_Assessment_Tools_for_Umbrella_Reviews\"><\/span><a id=\"_Toc232410212\"><\/a>Quality Assessment Tools for Umbrella Reviews<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<p>Evaluating the methodological quality of included SRMAs is essential to interpreting umbrella review findings. The quality of an umbrella review is ultimately contingent on the quality of its constituent SRMAs.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"AMSTAR-2_Primary_Tool\"><\/span>AMSTAR-2 (Primary Tool)<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>AMSTAR-2 is the most widely used tool for appraising systematic reviews in the context of umbrella reviews. It covers 16 items and distinguishes between critical and non-critical domains.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"ROBIS_for_Umbrella_Reviews\"><\/span>ROBIS for Umbrella Reviews<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p><a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC4687950\/\"><strong>ROBIS<\/strong> (Risk of Bias in Systematic Reviews)<\/a> is a tool specifically developed to assess the risk of bias, rather than just reporting quality, of systematic reviews included in an umbrella review.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"JBI_Critical_Appraisal_Checklist_for_Umbrella_Reviews\"><\/span>JBI Critical Appraisal Checklist for Umbrella Reviews<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>The <a href=\"https:\/\/jbi.global\/critical-appraisal-tools\">JBI (Joanna Briggs Institute) Critical Appraisal Checklist for Systematic Reviews and Research Syntheses<\/a> is part of a suite of design-specific JBI tools, widely used in nursing, allied health, and JBI-affiliated reviews.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"PRISMA_Checklist_for_Umbrella_Reviews\"><\/span>PRISMA Checklist for Umbrella Reviews<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p><a href=\"https:\/\/www.prisma-statement.org\/\">PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses)<\/a> is not a quality or risk-of-bias appraisal tool. It is a reporting guideline ensuring transparency and completeness of how a review (including umbrella reviews) is described.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Practical_note\"><\/span>Practical note<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>A common debate in umbrella reviews is whether to exclude low-quality SRMAs from the synthesis. Most methodologists recommend including all SRMAs regardless of quality (to avoid overestimating or underestimating effect sizes from incomplete data), while clearly reporting quality ratings and conducting sensitivity analyses that restrict findings to higher-quality reviews.<\/p>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Strengths_Limitations_of_Umbrella_Reviews\"><\/span><a id=\"_Toc232410216\"><\/a>Strengths &amp; Limitations of Umbrella Reviews<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Strengths\"><\/span>Strengths<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li>Provides the highest-level, most comprehensive overview of evidence on a broad topic in a single document<\/li>\r\n<li>Efficient for decision-makers: saves time compared to reading dozens of individual SRMAs<\/li>\r\n<li>Particularly valuable for health technology assessments evaluating all management options for a condition<\/li>\r\n<li>Resolves the &#8216;lumping vs. splitting&#8217; tension in research synthesis<\/li>\r\n<li>Enables comparison of the strength of evidence across multiple interventions, exposures, or outcomes simultaneously<\/li>\r\n<li>Can reveal contradictions between existing SRMAs and explain their sources<\/li>\r\n<li>Standardized re-analysis of each meta-analysis corrects errors in published SRMAs that used inappropriate statistical models<\/li>\r\n<li>Feasible in 6\u201310 weeks for professional teams, since primary data re-analysis is not required<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Limitations\"><\/span>Limitations<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<ul>\r\n<li><strong>&#8216;Garbage in, garbage out&#8217;: <\/strong>An umbrella review is wholly dependent on the accuracy and rigour of the included SRMAs. If the underlying reviews are biased, the umbrella review inherits those biases.<\/li>\r\n<li><strong>Cannot fill evidence gaps: <\/strong>If a research area lacks systematic reviews, an umbrella review cannot be conducted.<\/li>\r\n<li><strong>No <a href=\"https:\/\/www.editage.com\/insights\/a-handy-guide-to-individual-participant-data-meta-analysis\">individual patient data (IPD) analysis<\/a>: <\/strong>Because primary data are not re-examined, subgroup analyses at the participant level are not possible.<\/li>\r\n<li><strong>Overlap inflation:<\/strong> Even with CCA management, overlapping primary studies across SRMAs can create an illusion of more independent evidence than actually exists.<\/li>\r\n<li><strong>Difficulty in causal inference:<\/strong> For epidemiological umbrella reviews, confounding, reverse causality, and selection bias remain serious threats.<\/li>\r\n<li><strong>Clinical heterogeneity:<\/strong> Combining SRMAs that varied in their populations, interventions, comparators, and outcomes can make the overall synthesis clinically difficult to interpret.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span><a id=\"_Toc232410219\"><\/a>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Can_I_do_an_umbrella_review_if_some_of_the_systematic_reviews_I_find_are_low_quality_Do_I_have_to_exclude_them\"><\/span>Can I do an umbrella review if some of the systematic reviews I find are low quality? Do I have to exclude them?<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>This is one of the most commonly debated questions in umbrella review practice. The general methodological consensus is: include all eligible SRMAs regardless of quality, but clearly report quality ratings and conduct sensitivity analyses that restrict findings to higher-quality reviews.<\/p>\r\n\r\n\r\n\r\n<p>Excluding low-quality SRMAs a priori risks distorting the evidence base: either by overestimating or underestimating effect sizes from a selectively curated subset. Instead, assess quality using AMSTAR-2 (or ROBIS\/JBI), present the ratings transparently in a table, and discuss how the inclusion of lower-quality reviews may have influenced your overall conclusions. Sensitivity analyses restricted to &#8216;high&#8217; and &#8216;moderate&#8217; AMSTAR-2 ratings are the appropriate way to test whether your conclusions hold when low-quality reviews are removed.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"If_multiple_systematic_reviews_all_include_the_same_studies_isnt_the_%E2%80%98umbrella_review_just_inflating_the_evidence_base_and_showing_me_one_study_multiple_times\"><\/span>If multiple systematic reviews all include the same studies, isn&#8217;t the &#8216;umbrella review&#8217; just inflating the evidence base and showing me one study multiple times?<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>This concern is valid and points to the overlap problem, which is the most technically complex challenge in umbrella reviews. However, there are two important clarifications.<\/p>\r\n\r\n\r\n\r\n<p>First, umbrella reviews do not statistically pool the results of different meta-analyses into a grand combined estimate. Each SRMA is analysed and reported separately. So the inflation risk is interpretive, not arithmetical. Second, the standard approach is to calculate the Corrected Covered Area (CCA). CCA values are classified as slight (&lt;5%), moderate (5\u201310%), high (11\u201315%), or very high (&gt;15%). This metric helps readers understand how much of the apparent evidence is truly independent: a critical caveat that should be prominently reported.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Do_I_need_a_full_team_to_conduct_an_umbrella_review_or_can_I_do_it_alone_Is_it_really_faster_than_a_systematic_review\"><\/span>Do I need a full team to conduct an umbrella review, or can I do it alone? Is it really faster than a systematic review?<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Unlike a standard systematic review (which mandates double-screening and double-extraction by at least two independent reviewers) some guidance documents note that a team is not strictly required for umbrella reviews. That said, best practice still calls for independent dual-screening to minimise selection bias, and independent data extraction for key statistics.<\/p>\r\n\r\n\r\n\r\n<p>As for speed: yes, umbrella reviews are substantially faster than de novo systematic reviews. Professional teams can typically complete an umbrella review in 6\u201310 weeks. The time savings come from not having to search for, screen, and extract data from thousands of primary studies, only from a smaller pool of existing SRMAs. However, the statistical re-analysis step can add significant time for large umbrella reviews covering many associations.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Two_of_the_systematic_reviews_I_want_to_include_reach_completely_opposite_conclusions_on_the_same_question_What_do_I_do\"><\/span>Two of the systematic reviews I want to include reach completely opposite conclusions on the same question. What do I do?<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Contradictory conclusions across SRMAs on the same question are not a failure. In fact, exposing and explaining these contradictions is one of the most valuable contributions an umbrella review can make.<\/p>\r\n\r\n\r\n\r\n<p><strong>Common explanations include: <\/strong>different eligibility criteria (populations, comparators, or outcome definitions); different search dates; different statistical models (fixed-effect vs. random-effects); different quality thresholds; and language or publication bias differences in search strategies.<\/p>\r\n\r\n\r\n\r\n<p>Report the conflicting SRMAs side by side in your results tables, explain the likely sources of divergence in your discussion, and note what additional primary research would be needed to resolve the contradiction.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"Can_an_umbrella_review_include_non-intervention_reviews_like_reviews_of_prevalence_diagnostic_accuracy_or_qualitative_studies\"><\/span>Can an umbrella review include non-intervention reviews, like reviews of prevalence, diagnostic accuracy, or qualitative studies?<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>Yes, though most of the established methodology has been developed and applied in the intervention and epidemiological association contexts, umbrella reviews are not inherently restricted to these domains.<\/p>\r\n\r\n\r\n\r\n<p>Umbrella reviews of observational\/epidemiological SRMAs are now very common. Umbrella reviews of diagnostic accuracy SRMAs are feasible but require specialised statistical methods (bivariate\/SROC models). Umbrella reviews including qualitative systematic reviews are possible but remain methodologically less standardised. The JBI Manual for Evidence Synthesis provides specific guidance for umbrella reviews incorporating qualitative evidence alongside quantitative SRMAs.<\/p>\r\n\r\n\r\n\r\n<h3><span class=\"ez-toc-section\" id=\"When_an_umbrella_review_and_a_single_systematic_review_both_exist_on_the_same_question_which_should_I_cite_in_my_paper_or_guideline\"><\/span>When an umbrella review and a single systematic review both exist on the same question, which should I cite in my paper or guideline?<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n\r\n\r\n<p>When both exist, the umbrella review is generally preferred as the citation for evidence-based decision-making because it<\/p>\r\n\r\n\r\n\r\n<ol type=\"1\">\r\n<li>consolidates findings from multiple SRMAs,<\/li>\r\n<li>addresses the overlap problem,<\/li>\r\n<li>applies standardised quality assessment, and<\/li>\r\n<li>provides a more complete and reliable picture of the evidence than any single SRMA can.<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<p>The important caveat: an umbrella review is only as good as the quality and completeness of the SRMAs it synthesises. If the best available SRMA covers more recent trials than an older umbrella review, citing the updated SRMA alongside the umbrella review may be appropriate until an updated umbrella review is published.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"References\"><\/span><a id=\"_Toc232410220\"><\/a>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<ol type=\"1\">\r\n<li>Ten simple rules for conducting umbrella reviews. <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC10270421\/\">https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC10270421\/<\/a><\/li>\r\n<li>Types of Reviews: Umbrella Reviews. <a href=\"https:\/\/laneguides.stanford.edu\/types-of-reviews\/umbrella\">https:\/\/laneguides.stanford.edu\/types-of-reviews\/umbrella<\/a><\/li>\r\n<li>Umbrella reviews: a methodological guide. <a href=\"https:\/\/academic.oup.com\/eurjcn\/article\/24\/6\/996\/7974731\">https:\/\/academic.oup.com\/eurjcn\/article\/24\/6\/996\/7974731<\/a><\/li>\r\n<li>How to Conduct Umbrella Review in Education? A Step-by-Step Methodological Guide Through a Case Study in Digital Diaries. <a href=\"https:\/\/journals.sagepub.com\/doi\/10.1177\/20965311261421966\">https:\/\/journals.sagepub.com\/doi\/10.1177\/20965311261421966<\/a><\/li>\r\n<\/ol>\r\n","protected":false},"excerpt":{"rendered":"An umbrella review is a systematic review of systematic reviews and\/or meta-analyses (SRMAs); it synthesizes evidence at the highest available level, one step above individual SRMAs in the evidence hierarchy. It is also called an &#8216;overview of reviews,&#8217; &#8216;meta-review,&#8217; or &#8216;review of reviews&#8217;. These terms are largely interchangeable in the current literature, though Cochrane prefers [&hellip;]","protected":false},"author":3,"featured_media":897,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_ayudawp_aiss_exclude":false,"_ayudawp_aiss_summary":"In an umbrella review (a review that synthesizes findings from multiple systematic reviews\/meta-analyses on related topics), AMSTAR-2 is applied to each included systematic review to judge how trustworthy its conclusions are before they're pooled or compared. Unique use case: The umbrella review explicitly used the systematic review level to examine common biases and limitations across the field \u2014 demonstrating how umbrella reviews can serve a methodological surveillance function, not just a substantive evidence synthesis one. If the best available SRMA covers more recent trials than an older umbrella review, citing the updated SRMA alongside the umbrella review may be appropriate until an updated umbrella review is published.","_ayudawp_aiss_summary_provider":"manual","_ayudawp_aiss_summary_hash":"a664ea169258bc63800823eaa051459d5fde7f6e"},"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is an umbrella review? Definition, methods, examples, tools<\/title>\n<meta name=\"description\" content=\"Learn the purpose of an umbrella review, steps to register and conduct it, use of AMSTAR-2 and GRADE, umbrella review software.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.editage.com\/blog\/umbrella-review\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is an umbrella review? 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