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They are called prevalence
studies. They help us to know the economic, social burden of a
disease in a population in a point of time.
They can be: descriptive
or analytic. The descriptive only show the frequency of exposure and
of outcome in population in a point of time; in analytic studies we
search to show the exposure and outcome in a point of time,
searching associations with Prevalence Ratio or Odds Ratio.
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