The following table gives the results of a study of smoking and a specific type of cancer.

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The following table gives the results of a study of smoking and a specific type of cancer.

The following table gives the results of a study of smoking and a specific type of cancer.

Initial SurveyAmount of cigarettes smoked and the number (%) of subjectsFollow-up period
AmountNumber (%)Number of subjects followed for 5 years (%)*Number of cancer cases
None  2240 (37.6)2100 (93.8)12
Ex-Smoker1500 (25.2)1230 (82.0)18
1-19 / day1260 (21.1)950 (75.4)33
20+ / day960 (16.1)603 (62.8)29
Total5960 (100)4893 (82.1)92

                * percentage of those examined at the initial survey; assume that those lost to follow up were lost at 2 years

  1. What type of study is this? What branch of Epidemiology would it fall under?
  2. Calculate the cumulative incidence per 1,000 persons per year, and incidence rate for all enrolled in each group in the table above. (Attach calculations for full credit)

Calculate and interpret the Relative Risk for development of cancer among ex-smokers compared to non-smokers among all enrolled or all followed.

 

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