A case control study is not characterized by-

A. Cases with the disease are compared to controls without the disease

B. Assessment of past exposure may be blased

C. Definition of cases may be difficult

D. Incidence rates may be computed directly

Correct Answer: Incidence rates may be computed directly

Description: .<p>in case of a case control study ,we cannot measure incidence,and can only estimate the relative risk.and it doesnot distinguish between causes and associated factors.and it is also not suited to the evaluation of therapy or prophylaxis of disease.selectin of an appropriate control group may be difficult.</p><p>ref;parks textbook,22 nd ed,pg no 71</p>

Category: Social & Preventive Medicine

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