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| A study that compares two groups of people: those with
the disease or condition under study (cases) and a very similar group of
people who do not have the disease or condition (controls). Researchers
study the medical and lifestyle histories of the people in each group to
learn what factors may be associated with the disease or condition. For
example, one group may have been exposed to a particular substance that the
other was not. Also called a case-control study. |
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