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An umbrella review compiles evidence from multiple existing reviews and is one of the highest levels of evidence. Allowing easy comparison between other individual reviews, the umbrella review may address a broader question and can be useful for comparing interventions and developing guidelines.
Guidelines
Aromataris, E., Fernandez, R., Godfrey, C., Holly, C., Khalil, H., & Tungpunkom, P. (2014). The Joanna Briggs Institute reviewers’ manual 2014: methodology for JBI umbrella reviews. University of Adelaide: Joanna Briggs Institute. Full Text PDF
Aromataris, E., Fernandez, R., Godfrey, C. M., Holly, C., Khalil, H., & Tungpunkom, P. (2015). Summarizing systematic reviews: methodological development, conduct and reporting of an umbrella review approach. JBI Evidence Implementation, 13(3), 132-140. Full Text
Pollock, M., Fernandes, R. M., Becker, L. A., Pieper, D., & Hartling, L. (2020). Chapter V: overviews of reviews. Cochrane handbook for systematic reviews of interventions version, 6.v Full Text
Pollock, M., Fernandes, R. M., Newton, A. S., Scott, S. D., & Hartling, L. (2019). A decision tool to help researchers make decisions about including systematic reviews in overviews of reviews of healthcare interventions. Systematic reviews, 8(1), 1-8. Full Text
Fusar-Poli, P., & Radua, J. (2018). Ten simple rules for conducting umbrella reviews. Evidence-based mental health, 21(3), 95-100. Full Text
Biondi-Zoccai, G. (Ed.). (2016). Umbrella reviews: evidence synthesis with overviews of reviews and meta-epidemiologic studies. Springer. Catalogue Link
Avşar, T. S., McLeod, H., & Jackson, L. (2021). Health outcomes of smoking during pregnancy and the postpartum period: an umbrella review. BMC pregnancy and childbirth, 21(1), 1-9. Full Text