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Are case-control studies population based?
Population based case control studies are generally more expensive and difficult to conduct. A particular problem inherent in case-control studies is the selection of a comparable control group. Controls are used to estimate the prevalence of exposure in the population which gave rise to the cases.
Should controls and cases be selected from the same population?
Bias caused by differential errors in the measurement of cases and controls should be eliminated (e.g. use the same measurement tools in the same way for cases and controls). Controls should be selected from the same population – the source population (i.e. study base) – that gives rise to the study cases.
How do you describe a case-control study?
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).
What is a population based case control study?
Population Controls: A population-based case-control study is one in which the cases come from a precisely defined population, such as a fixed geographic area, and the controls are sampled directly from the same population.
How are case control studies used in analytic studies?
In the module entitled Overview of Analytic Studies it was noted that Rothman describes the case-control strategy as follows: “Case-control studies are best understood by considering as the starting point a source population, which represents a hypothetical study population in which a cohort study might have been conducted.
How are incidence rates calculated in case control studies?
If a cohort study were undertaken, we would define the exposed and unexposed cohorts (or several cohorts) and from these populations obtain denominators for the incidence rates or risks that would be calculated for each cohort. We would then identify the number of cases occurring in each cohort and calculate the risk or incidence rate for each.
How is epidemiology in practice in case control studies?
Epidemiology in Practice: Case-Control Studies NCBI Skip to main content Skip to navigation Resources How To About NCBI Accesskeys My NCBISign in to NCBISign Out PMC US National Library of Medicine National Institutes of Health