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2020-10-28

Which of the following claims about cohort and case-control studies is true, and which ones are false?

(I) Case-control studies are controlled experiments, whilst cohort studies are observational studies.

(II) Case-control studies are better for rare diseases, compared to cohort studies.

Pohanginah

Skilled2020-10-29Added 96 answers

Step 1 Result and Explanation:

(i) Observational Studies: Observational studies are an important category of study designs. Randomized controlled experiments are not always necessary or morally appropriate to carry out in order to answer some research questions in surgical procedures. Instead, observational studies might be the most effective approach to answer this kind of query. Cohort studies and Case-control studies are two primary types of observational studies that are evaluating associations between diseases and exposures. Observational studies fall under the category of analytical study designs and are further sub-classified as observational or experimental study designs. Case control studies and cohort studies offers specific advantages by measuring disease occurrence. Cohort and case-control studies both fall under the category of controlled experiments, whereas case-control studies are observational research.

Step 2 Result and Explanation:

(ii) Case-control studies are better for rare diseases, compared to cohort studies. It is true because they do not require a long follow-up period means as the disease has already developed and are hence much cheaper. It is also very suitable for diseases with a long period such as cancer. However, case-control studies are less adept at showing a casual relationship than cohort studies and there are more prone to bias. Cohort studies are not same as case-control studies, the exposure and outcomes have already happened.

Read carefully and choose only one option

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