A population of 1,000 healthy, at-risk people is monitored for 1 year starting o

Question

A population of 1,000 healthy, at-risk people is monitored for 1 year starting on January 1, and the development of cases of chicken pox is noted. No one has chicken pox at the start of the investigation. Twenty people develop chicken pox on June 30, and 40 people develop chicken pox on September 30. Assume that you can get chicken pox only once. What is the cumulative incidence of chicken pox in this population during the 1-year period from January 1 through December 31? (Points: 2)
20/1,000
40/1,000
60/1,000
60/108

Explanation / Answer

Total number of people developed chicken pox = 20 + 40 = 60

Total people in population = 1000

Hence,

Cumulative incident of chicken pox = 60/1000

Option C is correct.

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