oa South African Family Practice - Making sense of statistics for family practitioners : "case-control studies"
Extracted from text ... SA Fam Pract 2004;46(8) 31 Making Sense of Statistics Introduction A case-control study is an epidemiologic study that compares those with the disease (cases) with those without the disease (controls) in order to determine their frequency of past exposure to possible risk factors. In other words, this study design initially identifies the cases and controls and then collects information on exposure later. In case-control studies, the researcher can only investigate one disease at a time although many exposures to risk factors are simultaneously possible. When to use case-control studies? Ideally case-control studies are useful for studying rare diseases due to ..
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