Clinical trials – a guide for CAB members (page 7)

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• This is a diagram showing what a simple clinical trial comparing two medicines looks like. On the left you see the “study sample”. The study sample is all of the participants in the trial. On the right you can see that each of the volunteers in the “study sample” is assigned to a medicine group. In this case, each person is assigned to Group A or Group B. The medicines are different in each group, and the results of how they work against the illness or problem can be compared.
• A “study sample” is also sometimes called the “target population”.