Study limitations and dissemination bias are two of the eight GRADE domains, and two of the five domains that can lead to rating down of the certainty of the evidence. Evaluating study limitations involves considering whether flaws in the design or conduct of studies in a meta-analysis could bias the effect estimate. Evaluating dissemination bias involves considering whether there are results missing from a meta-analysis that could bias the effect estimate because of the nature of the missing results.
Session 4 of the GRADE Learning Live series covered how to rate study limitations and dissemination bias in systematic reviews of interventions.
Topics included:
- What are study limitations? What is dissemination bias?
- How do these domains relate to assessments of risk of bias in Cochrane reviews? ROB2 and ROB-ME assessments.
- How to evaluate study limitations and dissemination bias in reviews of interventions
- Impact of study limitations and dissemination bias on the certainty of evidence
- Overlap with other GRADE domains
The webinar was suitable for those wanting to use GRADE to interpret and summarise findings in a systematic review. An understanding of systematic review methods and content covered in the introductory session is assumed.
The session was delivered in July 2026 and below you will find the recording with the accompanying slides to download [PDF].
Presenter Bios
Ignacio Neumann is a physician and guideline methodologist with extensive experience in evidence synthesis and the development of clinical practice guidelines. He is an active member of the GRADE Working Group, where he contributes to methodological advances in assessing certainty of evidence, defining decision thresholds, and strengthening the integration of evidence into recommendations. He is also actively involved in the development of digital and AI-enabled tools designed to support structured evidence translation. His work focuses on preserving methodological rigor while enhancing accessibility, transparency, and the scalability of evidence-based recommendations across clinical and public health settings.
Sue Brennan is the director of the Melbourne GRADE Centre and a co-convenor of the Cochrane GRADEing methods groups. Her expertise is in systematic review and guideline methodology, with a focus on evidence-informed decision-making in public health. She co-led the InSynQ tool for developing synthesis questions, is an author of four core chapters in the Cochrane Handbook for Systematic Reviews of Interventions, and co-author of the PRISMA 2020, PRIOR and SWIM reporting guidelines. She has led over 40 reviews and methodological reviews commissioned by government to inform national guidelines and financing decisions. Through her roles in GRADE and Cochrane, she works with researchers, policy-makers and health professionals to implement best practice methods in evidence synthesis and guideline development.
