The table shows cardiovascular disease rates in four comparable groups.
Table
| Group | Smoking status | Activity level | Cases per 1000 adults |
|---|---|---|---|
| P | Smoker | Low | 60 |
| Q | Smoker | High | 40 |
| R | Non-smoker | Low | 30 |
| S | Non-smoker | High | 20 |
Which statement is supported when activity level is held constant and when smoking status is held constant?
Smoking doubles the rate; higher activity reduces the rate by one-third.
Smoking triples the rate; higher activity reduces the rate by one-third.
Smoking triples the rate; higher activity reduces the rate by one-half.
Smoking doubles the rate; higher activity reduces the rate by one-half.
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.