The risk of lung cancer in smokers over a 20 year period is 10%, while the risk

Question

The risk of lung cancer in smokers over a 20 year period is 10%, while the risk of lung cancer in non-smokers over a 20 year period is 1%. Over this time period, 20% of the population were smokers. In the last question. you calculated: a. The risk difference (also called attributable risk) b. The attributable proportion in the exposed (also called attributable risk proportion) c. The population attributable risk (also called the population risk difference) For each of the values you calculated, write the interpretation of the value you found.NOTE: This is a bonus, so credit will only be given for thorough and completely correct answers.

Explanation / Answer

Hi

Risk difference can be calcualated using formula: [a/(a+b)] / [c/(c+d)]
a = test sample with cancer = 10
b= test sample without cancer =90
c= control sample with cancer= 1
d = cntrol without cance= 99
Apply the formula; Answer = 10

Populaton attributation risk = 0.045
Relative risk =10
Incidence disease in test / control population
It compares te risk of having a disease for not recieving medical treatment with that of the people recieving treatment.

attributable risk =0.09
It is the reduction in incidence if the entire population was unexplored.

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