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Overview
  • Prevalence 
    • total cases in population at given time / total population at risk
    • = Incidence * disease duration
      • seen in cross-sectional studies
  • Incidence
    • new cases in population over a given time period / Total population at risk during that time
      • NOTE: people who already have the disease are NOT counted among those at risk when calculating incidence  
        • seen in cohort studies
  • Prevalence > incidence in chronic diseases
  • Prevalence = incidence in acute diseases
 

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