Quantitative Methods 2017

Odds Ratio analysis

Case-control study

Historical data

Exposed

Unexposed

Disease

Population

Exposed

No Disease

Unexposed

Disease Cases

Control Cases

Exposed

a

b

Unexposed

c

d

a  d b  c

Odds Ratio = = = Odds of Exposure in Disease Odds of Exposure in Controls a / c b / d

FMB