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Explanation:
Purpose of Case Control Studies
To determine whether or not an association exists between a disease and a particular risk factor. To start with a group of people with disease and work back to see whether a possible risk factor may be the cause. It may be the first step in testing a hypothesis.
To assess whether an association between a disease and a specific risk factor exists or not. Starting with a group of people with illness and working back to see if the cause could be a potential risk factor. In testing a hypothesis, this may be the first step.