What’s the definition of a cohort?
A cohort is any group of people, usually followed through time; this might be a study population in an observational or randomized study or another group of individuals.
What’s the definition of prevalence?
Prevalence is a description of the extent to which some factor—an exposure or a disease condition—is present in a population. With obesity for example were interested in the number of people currently living in a certain population who are obese.
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