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Table 3: Number and rate (per 100,000 person-years) of lung cancer deaths by number of cigarettes smoked per day, Doll and Hill physician cohort study, Great Britain, 19511961.

6. Accurately calculates the lung cancer mortality rates for each smoking category. Be sure to show your calculations.

1-14. (1000*22)/38600=.57

15-24. (1000*54)/38900=1.39

25+. (1000*57)/25100=2.27

7. Describe the trends or patterns you see in the data about mortality, and explain what the trends or patterns mean.

8. Accurately calculate the incidence for lung cancer during the 10 year time period. Be sure to show your calculations.

1-14. .57*10 years=5.70

15-24. 1.39*10 years=13.90

25+. 2.27*10 years=22.70

9. Accurately calculate the prevalence for lung cancer during this 10 year time period. Be sure to show your calculations.

Daily number of cigarettes smoked 0 1-14 Deaths from lung cancer 3 22 Mortality rate per 1,000 person- years Person- years at risk 42,800 38,600 38,900 25,100 0.07 0.57 15-24 54 1.39 57 2.27 25+ All smokers Total 133 136 102,600 145,400 Daily number of cigarettes smoked 0 1-14 Deaths from lung cancer 3 22 Mortality rate per 1,000 person- years Person- years at risk 42,800 38,600 38,900 25,100 0.07 0.57 15-24 54 1.39 57 2.27 25+ All smokers Total 133 136 102,600 145,400

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