They then look back retrospectively to try and find associations between the patients.Tags: 2004 Anti - Semitic Essay AdbustersReferral Cover LettersCollege Application Essay MusicFirst Person Essay ExampleIb Extended Essay AssessmentWhat Is Frontier ThesisPleasing Child Essay
A retrospective study is an observational study that enrolls participants who already have a disease or condition.
In other words, all cases have already happened before the study begins.
A historical epidemiological study a control would be unthinkable, and perhaps even useless.
Therefore, if you look at clinical studies, medical sites, or anything to do with medicine, you’ll find the two terms are interchangeable. education, the social sciences), there are different types of possibility for studies such as a retrospective case series, which do not use controls at all.
A retrospective case-control uses these two groups and looks back to the past for data and possible risk factors.
A matched case-control study chooses controls based on some matching factor, like age, weight or severity of disease. For example, a physician might encounter a series of patients who all have the same disease.
Thus, a matched design may require controlling for the matching factors in the analysis.
However, it is not the case that a matched design requires a matched analysis.
As such, it is a much weaker design than case-control.
Back to Top A retrospective longitudinal study involves repeated observations of the variables over a long period of time.