Exclusion criteria define the patient characteristics that should not be included in a study
When choosing exclusion criteria in a research study, "statistical noise" associated with members outside of the population of interest can be deterred. These types of individuals are often at risk of being lost to follow-up, do not possess characteristics central to the research question and investigation, or may be at risk of adverse side effects as a result of treatment. It is good to have as few exclusion criteria as possible so as to not miss out on the diversity associated with human populations.
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