The table shows results from a study of coronary heart disease. All groups were followed for the same time.
Table
| Smoking | Blood pressure | Cases per 1000 adults |
|---|---|---|
| No | Normal | 15 |
| Yes | Normal | 30 |
| No | High | 40 |
| Yes | High | 80 |
Which statement is supported by both comparisons between adults with the same blood pressure?
Smoking is associated with 15 more cases per 1000 adults.
Smoking is associated with twice as many cases per 1000 adults.
Smoking is associated with 40 more cases per 1000 adults.
Smoking is associated with half as many cases per 1000 adults.
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.