The nurse wishes to measure the number of cases of staph infections that occur in a hospital over the course of 1 year per total client-days during that year. Which measure should the nurse use?
A) Incidence density
B) Prevalence rate
C) Relative risk ratio
D) Specific rate
Ans: A
Feedback:
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. Relative risk ratio is the ratio of the incidence rate in the exposed group to the incidence rate in the nonexposed group. 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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