Systematic reviews on interventions for COVID-19 have rarely graded the certainty of the evidence.
Ana Luiza Cabrera MartimbiancoRafael Leite PachecoCarolina de Oliveira Cruz LatorracaRaphael Einsfeld Simões FerreiraRachel RieraPublished in: Sao Paulo medical journal = Revista paulista de medicina (2021)
Most of the systematic reviews on interventions relating to COVID-19 omitted assessment of the certainty of the evidence. This is a critical methodological omission that must not be overlooked in further research, so as to improve the impact and usefulness of syntheses relating to COVID-19.