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Cohort study: relative risk

      9

2

Unexposed

      4

24

Exposed

not ill

ill

At start of cohort study you know everyone’s exposure status

total exposed = 28;      total unexposed = 11

go forward in time and determine risk of getting ill

risk if exposed          =  24 / 28          =   0.857

risk if not exposed    =   2 / 11           =  0.182

Relative Risk             =  0.85 / 0.18    =   4.71

28

11

total

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