What is Cohort Study- DNB ENT Theory Question

Last modified: May 30, 2021
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Cohort Study

  • Observational/Analytical study
  • Obtain evidence to support or refute existence of association between a cause and disease
  • Usually Prospective study/ Longitudinal study/ “Forward looking study”
  • Follow up at different time points, while actively looking for the outcome
  • Cause to effect
  • Eg.: Role of exposure to dyes in development of Bladder cancer

Points

  • Cohorts identified before disease appearance
  • Study groups observed over specified period of time, to determine disease incidence

Framework of a cohort study:

COHORT Disease present Disease absent Total
Exposure Present a b a + b
Exposure Absent c d c + d
  a + c b +d  

Incidence of disease among exposed = a/ a + b Incidence of disease among non-exposed =c/ c + d

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