Incidence rates for groups exposed to a secondhand smoke are compared with the incidence rates for people who are not exposed to secondhand smoke. This will measure the:
A) Incidence density
B) Prevalence rate
C) Relative risk ratio
D) Specific rate
Ans: C
Feedback:
Relative risk ratio is the ratio of the incidence rate in the exposed group to the incidence rate in the nonexposed group. Incidence density is the use of a person-time denominator in the calculation of rates. A person-day reflects one person at risk for 1 day, and a person-year represents one person at risk for 1 year. Prevalence rate is the measure of the number of people in a given population who have an existing condition at a given point in time. Specific rates are detailed rates that are calculated using the number of people in the smaller subgroups of the population in the denominator.
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