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 |
| χ2=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 |