A doctor compares treatments for patients with narrowed coronary arteries. The table shows results from comparable groups after one year.
Table
| Treatment | Patients studied | Patients with improved blood flow | Patients with serious complications |
|---|---|---|---|
| P | 500 | 450 | 15 |
| Q | 1000 | 850 | 10 |
| R | 800 | 560 | 4 |
| S | 400 | 360 | 8 |
The doctor selects a treatment that improves blood flow in at least 80% of patients and causes serious complications in fewer than 2% of patients.
Which treatment meets both criteria?
Treatment S
Treatment R
Treatment P
Treatment Q
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.