# Matched Case Control Study

We only get odds ratio from a case–control study, which is an inferior measure of strength of association as compared to relative risk.

We only get odds ratio from a case–control study, which is an inferior measure of strength of association as compared to relative risk.

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Numbers of cases and controls do not have to be equal.

In many situations, it is much easier to recruit controls than to find cases.

If the outcome of interest is uncommon, however, the size of prospective investigation required to estimate relative risk is often too large to be feasible.

In retrospective studies the odds ratio provides an estimate of relative risk.

Random sampling could then be used on the non-diseased population to form the control group.

Other Advantages: ------------------------------------------------------------------------------ Need help with a homework or test question? Case-Control Study A case-control study is a retrospective study that looks back in time to find the relative risk between a specific exposure (e.g. The goal is figure out the relationship between risk factors and disease or outcome and estimate the odds of an individual getting a disease or experiencing an event. A control group of people who do not have the disease or who did not experience the event is used for comparison.With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. - Includes many concepts such as sample size, hypothesis tests, or logistic regression, explained by Stephanie Glen, founder of Statistics How To. A case–control study (also known as case–referent study) is a type of observational study in which two existing groups differing in outcome are identified and compared on the basis of some supposed causal attribute.Most sources of error due to confounding and bias are more common in retrospective studies than in prospective studies.For this reason, retrospective investigations are often criticised.The study usually involves taking a cohort of subjects and watching them over a long period.The outcome of interest should be common; otherwise, the number of outcomes observed will be too small to be statistically meaningful (indistinguishable from those that may have arisen by chance).They have pointed the way to a number of important discoveries and advances.The case–control study design is often used in the study of rare diseases or as a preliminary study where little is known about the association between the risk factor and disease of interest.