In a population-based cohort study, an entire community was interviewed regardin

Question

In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. Upon ascertainment of all lung cancer deaths, the investigator obtained the following data:

Number of individuals

Lung cancer deaths

Smokers

24,500

15

Non-smokers

10,500

2

     4)    Calculate the proper measure of association of smoking and lung cancer death. Interpret your results.

    5)     Calculate the population risk difference. Interpret your results.

   6)      Calculate the population etiologic fraction for smoking and lung cancer based on these data. Interpret your results.

Number of individuals

Lung cancer deaths

Smokers

24,500

15

Non-smokers

10,500

2

Explanation / Answer

The relative risk is used to measure the association of smoking and lung cancer.
Using the Rater Ratio to estimate the RR
= 15/100000 =7.5
2/100000

Relative Risk=1
The relative risk is greater than 1 which shows an association between exposure and disease and there is an exposure between smoking and lung cancer.

2.Calculate the population risk difference.
Risk Difference = AR = I of smoker – I of non- smoker
Smoke Lung Cancer Total
Yes No
Yes

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