Scientists studied the link between smoking and deaths from coronary heart disease.
The Table shows their results.
Table
| Number of cigarettes smoked per day | Deaths from coronary heart disease per 100 000 people per year |
|---|---|
| 0 | 120 |
| 1 to 14 | 210 |
| 15 to 24 | 290 |
| 25 or more | 380 |
Calculate the percentage increase in deaths from coronary heart disease for people who smoke 25 or more cigarettes per day compared with people who do not smoke.
Describe the relationship shown in the Table.
The results are given per 100 000 people.
Give the reason why.
A student concluded that smoking causes coronary heart disease.
Explain why these data alone do not prove this.
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.