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Rus_ich [418]
3 years ago
5

Controls are needed in a case-control study because: A. They are matched to the cases for suspected etiologic factors B. They ma

y be followed to determine if they develop the disease in question C. They increase sample size, so that statistical significance may be achieved D. They provide a comparable estimate of the frequency of exposure in the absence of disease E. They reduce bias
Social Studies
1 answer:
andreyandreev [35.5K]3 years ago
5 0

Answer:

D. They provide a comparable estimate of the frequency of exposure in the absence of disease                                    

Explanation:

Case-control study: The case-control study is also referred to as a case-referent study. This is one of the types of observational study that compares and identifies two different groups which differs in outcome based on a few casual attributes.

In the case-control study, two steps are involved:

1. To identify the cases. Here, the cases are known as a group that consists of the outcome.

2. The controls are a group which is known to be free from the outcome.

In the question above, controls are needed in a case-control study because they provide a comparable estimate of the frequency of exposure in the absence of disease.

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