Question

Researchers at an epidemiology clinic have conducted a study investigating the relationship between exposure to asbestos and lung cancer. The following table represents the findings from the study after a follow-up period of 10 years.

	Lung Cancer	No Lung Cancer	Total
Asbestos Exposure +	153	201	354
Asbestos Exposure -	23	664	687
Total	176	865	1041

Calculate the proportion of lung cancer cases in the exposed

and unexposed

Answer 1

Total number of people exposed = 354

Total number of lung cancer cases in the exposed = 153

So, the proportion of lung cancer in the exposed =

Again,

Total number of people unexposed = 687

Total number of lung cancer cases in the unexposed = 23

So the proportion of lung cancer cases in the unexposed =

Also,

Total number of lung cancer cases (exposed+unexposed) = 176

Total number of people (exposed + unexposed) = 1041

So, Total number of lung cancer cases in the exposed and unexposed =