A case-control study enrolled 110 patients with multiple sclerosis (MS) and matched them to 110 people without MS. They assessed a history of influenza vaccination. They reported the following numbers of case/control pairs with different combinations of the exposure (vaccination) and non-exposure (non-vaccination).
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- From the data provided, we can see that there are 40 case/control pairs with a history of influenza vaccination. Show more…
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