Epi Unit 10
Which of the following calculates the incidence in the exposed in a cohort study? (a/a+c) (a/a+b) (c/a+c) (c/c+b)
(a/a+b)
Which of the following calculates the proportion of cases exposed in a case-control study? (a/a+b) (a/a+c) (a/a+d) (a/c+d)
(a/a+c)
Which of the following calculates the incidence in the nonexposed in a cohort study? (a/a+b) (a/a+c) (c/c+d) (c/a+c)
(c/c+d)
T/F Compared to a case-control study, a cohort study is best when evaluating rare diseases.
False
T/F The formula for the odds ratio in both a case-control and cohort study is ac/bd.
False
T/F The odds ratio in a matched pair study is calculated based on concordant pairs.
False
T/F Compared to a case-control study, a cohort study usually requires a large population.
True
T/F Risk is the probability of an event occuring.
True
T/F The odds of an event can be defined as the ratio of the number of ways the event can occur (success) to the number of ways the event cannot occur (failure).
True
T/F The odds ratio is a common mesaure of risk in a case-control study.
True
T/F The proportion of the total incidence of disease in the exposed group attributable to the exposure can be calculated by subtracting the incidence of disease in the non-exposed group from the incidence in the exposed group and dividing the value by the incidence in the exposed group.
True
T/F The relative odds (odds ratio) is a useful measure of association in both case-control and cohort studies.
True
T/F You can estimate the incidence attributable to the exposure in the total population if you know the incidence in the exposed group, incidence in the nonexposed group, and the percent of the exposed or nonexposed group in the total population.
True
The odds ratio (relative odds) is a good approximation of the relative risk when the following conditions are met (Select all that apply): - When the cases studied are representative, regarding the history of exposure, to all people with the disease in the population from which the cases were drawn. - When the controls studied are representative, regarding the history of exposure, to all people without the disease in the population from which the cases were drawn. - When the disease studied does not occur frequently.
all 3 - When the cases studied are representative, regarding the history of exposure, to all people with the disease in the population from which the cases were drawn. - When the controls studied are representative, regarding the history of exposure, to all people without the disease in the population from which the cases were drawn. - When the disease studied does not occur frequently.
Studies have found that approximately 53% of liver disease is due to alcohol consumption. This is an example of:
attributable risk
