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Table 1 Types of questions about healthcare interventions that overviews can examinea

From: Preferred Reporting Items for Overviews of Reviews (PRIOR): a protocol for development of a reporting guideline for overviews of reviews of healthcare interventions

1Different interventions for the same condition or population.
2Different approaches to the application of the same intervention for the same condition or population.
3Same intervention for different conditions or populations.
4Adverse effects of an intervention for one or more conditions or populations.
5The same intervention for the same condition or population, where different outcomes or time points are addressed.
  1. aFrom Pollock et al. 2019 Cochrane Handbook chapter on overviews of reviews [draft] [1]