Select the false statement about case control studies O a Are warranted when we

Question

Select the false statement about case control studies O a Are warranted when we may suspect any one of several exposures, but when we have no strong evidence yet to suggest an association of any one of the suspect exposures with the disease in question. O b. Are most valuable when the disease being investigated occurs quickly after exposure, so that the epidemiologist does not have to spend a lot of time waiting for the development of disease. O c. Are often the first step in determining whether an exposure is linked to disease. O d. Are more useful than the cohort study when the disease being investigated is rare O e. None of the above

Explanation / Answer

Ans:

Option b is false.

Explanation:

Case-control study designs are used to estimate the relative risk for a disease from a specific risk factor.(c is correct)

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. Compared to prospective cohort studies they tend to be less costly and shorter in duration.(d is correct)

it is useful as a first step when searching for a cause of an adverse health outcome. at an early stage in our search for an etiology, we may suspect any one of several exposures, but we may not have evidence, and certainly no strong evidence, to suggest an association of any one of the suspect exposures with the disease in question.(a is correct)

Cohort studies more clearly indicate the temporal sequence between exposure and outcome, because in a cohort study, subjects are known to be disease-free at the beginning of the observation period when their exposure status is established. In case-control studies, one begins with diseased and non-diseased people and then acertains their prior exposures.(b is incorrect,as case control we already have diseased and non diseased people categroziation at the beginning)

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