What are the variables to be included and excluded?In research?

Variables that need to be included or excluded are defined by the research being done and its limitations also.

OR Inclusion and exclusion criteria may include factors such as age, sex, race, ethnicity, type and stage of disease, the subject's previous treatment history, and the presence or absence (as in the case of the “healthy” or “control” subject) of other medical, psychosocial, or emotional conditions.

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