Quantitative Methods 2017

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Odds Ratio analysis

Case-control study

Population

Disease

No Disease

Historical data

Exposed

Unexposed

Exposed

Unexposed

Disease

Cases

Control

Cases

Exposed

a

b

Unexposed

c

d

Odds Ratio = = =

Odds of Exposure in Disease

Odds of Exposure in Controls

a / c

b / d

a



d

b



c