Inclusion and exclusion criteria should be established during protocol development or before proceeding with the searches. It is used to determine what studies from the comprehensive, reproducible searches will be used in your article to answer your research questions or objectives.
"The population, intervention and comparison components of the question, with the additional specification of types of study that will be included, form the basis of the pre-specified eligibility criteria for the review. It is rare to use outcomes as eligibility criteria: studies should be included irrespective of whether they report outcome data, but may legitimately be excluded if they do not measure outcomes of interest, or if they explicitly aim to prevent a particular outcome." (McKenzie et al., 2022)
Examples of inclusion/exclusion criteria:
Objective: We aimed to assess the effectiveness of interactive social media interventions, in which adults are able to communicate directly with each other, on changing health behaviours, body functions, psychological health, well‐being, and adverse effects.