A case–control study selects subjects according to an outcome: cases have the outcome and controls represent an appropriate comparison population. It compares their prior exposures or genetic variants to study association. Its retrospective sampling must be accounted for when interpreting risks; selection bias and confounding can distort an unadjusted association. In genetics, matched family pseudo-control genotypes can replace unrelated controls for a conditional transmission disequilibrium test.
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A case-control study is a type of observational research design commonly used in epidemiology and clinical research. It aims to identify and evaluate the associations between exposures (such as risk factors, behaviors, or environmental factors) and specific outcomes (typically diseases or health conditions). Here’s a breakdown of its key features: ### Characteristics of Case-Control Studies: 1. **Two Groups**: - **Cases**: Individuals who have the disease or outcome of interest.