Limitations cohort studies are more costly and there

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Exposure is rare. Limitations: Cohort studies are more costly and there is a greater chance of losing subjects to follow-up based on the long time period over which the cohort is followed. Appropriate measure of association: The measure of association between exposure and disease in cohort studies is the relative risk. The relative risk is the ratio of the incidence rate of index subjects to that of control subjects. A relative risk of 1.0 signifies that the incidence rate is the same among exposed and non-exposed subjects and indicates a lack of association between exposure and disease. A relative risk of less than 1.0 provides evidence for a protective effect of exposure (the incidence rate of disease among exposed is lower than non-exposed) whereas a relative risk
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above 1.0 suggests that exposed people are at higher risk of disease than non-exposed persons. 3. Experimental Studies: An experimental study, also known as a trial, investigates the role of some agent in the prevention or treatment of a disease. In this type of study, the investigator assigns individuals
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