The table shows a study of smoking and lung disease.
Table
| Age group | Smoking status | Adults studied | Adults with lung disease |
|---|---|---|---|
| Under 50 | Non-smoker | 800 | 16 |
| Under 50 | Smoker | 200 | 8 |
| 50 and over | Non-smoker | 200 | 20 |
| 50 and over | Smoker | 800 | 120 |
Which statement is supported by comparisons within both age groups?
Smokers have a lower disease percentage, although the decrease differs by age.
Smokers have a higher disease percentage, although the increase differs by age.
Smokers have twice the disease percentage, with the same ratio at each age.
Smokers have the same disease percentage, after the group sizes are considered.
44 exam-style questions on Edexcel GCSE Biology 5.4 Non-communicable diseases, covering 5.4.1 Interaction of factors in non-communicable disease, 5.4.2 Lifestyle factors and non-communicable disease, and 5.4.3 Treatments for cardiovascular disease. Each one has a worked solution and a mark scheme showing where the marks go.