Over the course of a year, there were 42 cases of institution-associated pneumonia at a hospital. During that time, 3,102 clients were at risk for acquiring this infection, covering a total of 20,411 client-days
Which is the client density in terms of number of cases per 1,000 client-days at this hospital during this time?
A) 2.1
B) 13.5
C) 15.2
D) 152
Ans: A
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Incidence density is calculated by dividing the number of new cases occurring during the study period by the person-time units accumulated by subjects during the study period and multiplying the result by the base multiple of 10. In this case, the following equation would result: 42/20,411 = 0.0021 × 1,000 = 2.1 cases per 1,000 client-days.
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