The association between disease & risk factor in a case control study is studied by –
**Core Concept**
A case-control study is a type of observational study used to investigate the relationship between a disease and its potential risk factors. In this design, individuals with the disease (cases) are compared to those without the disease (controls) to identify potential associations between the disease and various risk factors.
**Why the Correct Answer is Right**
The association between disease and risk factor in a case-control study is studied by analyzing the odds ratio (OR) or relative risk (RR) of the exposure to the risk factor among cases compared to controls. This is typically done using logistic regression analysis or other statistical methods. The OR or RR can indicate the strength and direction of the association, helping researchers to infer causality.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because case-control studies are not designed to establish temporality or causality, which is a key aspect of studying disease and risk factor associations.
**Option B:** This option is incorrect because cohort studies are a different type of observational study design that involves following individuals over time to assess the development of disease in relation to risk factors.
**Option C:** This option is incorrect because laboratory studies involve experiments conducted in a controlled environment and are not used to study disease and risk factor associations in humans.
**Clinical Pearl / High-Yield Fact**
When interpreting case-control study results, it's essential to consider the potential for confounding variables, which can lead to biased estimates of the association between disease and risk factor. This can be mitigated by using statistical methods that control for confounding or by using cohort studies, which can provide more direct evidence of causality.
**Correct Answer: C. Case-control studies are used to investigate the relationship between disease and risk factor by analyzing the odds ratio (OR) or relative risk (RR) of exposure to the risk factor among cases compared to controls.**