Case base sampling is the predominant method of selecting controls in traditional case-control studies
Case-base sampling: At the start of the follow-up period of the cohort study that the case-control study was nested within, controls are chosen from the population at risk.
To see if a high-fat diet and colon cancer are related, for instance, researchers carried out a case-control study. In North Carolina, cases of colon cancer were all proven to have occurred in 2010. A group of North Carolina citizens without colon cancer served as the controls. There was a 4.0 odds ratio.
Case-control research is made to see if exposure is connected to a certain result. Case-based sampling has a straightforward theoretical explanation. Identify the controls and cases first.
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