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Chapter 9. Case-Control Studies

In a case-control study, the individuals with the disease of interest are limited to those who are newly diagnosed. We may describe these cases as

A. hospital based.

B. prevalent.

C. incident.

D. population based.

E. none of the above.

In a hospital-based case-control study, which of the following guidelines may be useful in sampling controls?

A. Choose them from a single diagnostic category

B. Choose them from a variety of diagnostic groups

C. Choose them from chronic conditions

D. Choose them from acute conditions

E. A and C

F. B and D

In a case-control study, matching may be performed to select controls in order to

A. control confounding.

B. control selection bias.

C. improve statistical precision.

D. increase the strength of association.

E. A and C.

F. B and D.

In contrast to a prospective cohort study, a case-control design may be preferred for the study of

A. rare exposures.

B. rare diseases.

C. shorter latent periods.

D. long latent periods.

E. A and C.

F. B and D.

The preferred measure of association in a case-control study is the

A. risk ratio.

B. rate ratio.

C. odds ratio.

D. attributable risk.

E. attributable risk percent.

Increasing the number of controls per case in a case-control study tends to reach diminishing returns in terms of increasing statistical power beyond what ratio?

A. 0.5 controls per case

B. 1.0 control per case


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