Numbers of lung cancers and person-years of observation by 
age and smoking level among British male doctors.

(free format)

Data Items

1 SmokeL        Lower limit of smoking category
                (cigarettes smoked per day)

2 SmokeU        Upper limit of smoking category
                (cigarettes smoked per day)

3 Average       Average number smoked per day

4 AgeL          Lower limit of Age category

5 AgeU          Upper limit of Age category

6 Cancers       Number of cancers

7 PY            Person Years of observation

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Taken from

Table 4.21, page 163 in Breslow and Day volume II.