Table 3
Distribution of smoking habits in the classes of years worked as baggers (known length of job)
Length of exposure as baggers
Smoking habits
No. baggers
⩽3.6 years
>3.6 years
χ
2
=8.638; p=0.1950 (6 degrees of freedom).
Non-smokers
91
8
6
Smokers, 1–10 cigarettes/day
32
4
2
Smokers, 11–20 cigarettes/day
69
8
13
Smokers, ⩾21 cigarettes/day
20
5
4