Researchers conducted a cohort study to examine the association between a diet h

Question

Researchers conducted a cohort study to examine the association between a diet high in fat and the risk of colon cancer. The researchers believe that vitamin use may be a confounder but they first need to examine whether or not vitamin use is an effect measure modifier. Does Not Take Vitamin Colon No Colon Colon No Colon Colon No Colon Takes Vitamin linial Cancer CancerCancer CancerCancerCancer 254 2220 High Fat Diet 150 1830 104 390 No High Fat Die80 1500 18 800 98 Calculate the stratified risk ratios.

Explanation / Answer

Stratified risk ratio

People who takes vitamin = (150/1980) / (80 / 1580 )

= 1.49

(1980 (150 + 1830) and 1580 (80+1500) are total people who takes vitamin respectively from both rows )

People who doesnot take vitamin = ( 104 /494 ) / (18/ 819)

= 9.59

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