A clinical study investigated a potential association between Peripheral Artery Disease (PAD) and two other cardiovascular outcomes: stroke and myocardial infarction. The study monitored 35,000 patients diagnosed with PAD and recorded that 1,050 patients suffered a stroke and 1,400 suffered a myocardial infarction. The study also monitored a control group of 15,000 patients without PAD and recorded that 450 suffered a stroke and 750 suffered a myocardial infarction. The researchers concluded: 'Patients with PAD have the same risk of stroke as patients without PAD, but they have a lower risk of myocardial infarction than patients without PAD.' Explain how the data support this conclusion by calculating the percentage of patients in each group who experienced each condition.
97 exam-style questions on OCR GCSE Biology 6.3 Monitoring and maintaining health, covering 6.3.1 Health and disease, 6.3.2 Interactions between diseases, 6.3.3 Spread of communicable diseases, 6.3.4 Common infections and diseases, 6.3.5 Physical plant defence responses, 6.3.6 Chemical plant defence responses, 6.3.7 Detecting and identifying plant diseases, 6.3.8 White blood cells and platelets, 6.3.9 Non-specific defence systems, 6.3.10 The immune system, 6.3.11 Monoclonal antibodies, 6.3.12 Vaccines and medicines, 6.3.13 Aseptic techniques, 6.3.14 Discovery and development of new medicines, 6.3.15 Causes of non-communicable diseases, 6.3.16 Treatments for cardiovascular disease, 6.3.17 Lifestyle factors and non-communicable diseases, 6.3.18 Cancer, 6.3.19 Stem cells in medicine, 6.3.20 Gene technology in medicine, and 6.3.21 The human genome and medicine. Each one has a worked solution and a mark scheme showing where the marks go.