A new medicine is intended to reduce the number of days that patients have symptoms of a long-term disease.
Patients were allocated at random to three equal-sized groups. Each patient received one treatment every day for 28 days.
| Daily treatment | Mean decrease in number of days with symptoms | Patients reporting harmful side effects (%) |
|---|---|---|
| Placebo | 0.8 | 3 |
| 5 mg medicine | 5.2 | 5 |
| 15 mg medicine | 5.8 | 22 |
Evaluate which dose of the medicine should be selected for the next stage of testing.
252 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.