1. The following table gives the results of a study of smoking and a specific type of cancer. (50 points)

Initial Survey

Amount of cigarettes smoked and the number (%) of subjects

Follow-up period

Amount

Number (%)

Number of subjects followed for 15 years (%)*

Number of cancer cases**

None

2240 (37.6)

2100 (93.8)

15

Ex-Smoker

1500 (25.2)

1230 (82.0)

20

1-19 / day

1260 (21.1)

950 (75.4)

44

20+ / day

960 (16.1)

603 (62.8)

50

Total

5960 (100)

4883 (81.9)

129

*percentage of those examined at the initial survey; assume that those lost to follow up were lost at 7 years*

**assume that all cases were identified at 15 year timepoint

1. What type of study is this? What branch of Epidemiology would it fall under?
3. Calculate the cumulative incidenceper 1,000 persons per year,andincidence rate for all enrolled in each group in the table above. (Attach calculations for full credit)
5. Calculateandinterpret the Relative Risk for development of cancer among ex-smokers compared to non-smokers among all enrolled or all followed.(Attach calculations for full credit)