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Suppose children in two schools (A and B) received chicken pox vaccines at the beginning of...

Suppose children in two schools (A and B) received chicken pox vaccines at the beginning of the school term. An outbreak of chicken pox occurred in the area and both schools were monitored for chicken pox cases. Children at School A (n = 250) were followed for 12 months and those at School B (n=300) were followed for 9 months. Using person-time to compare the two populations would yield a. Incidence rates b. Cumulative incidence c. Incidence density d. Prevalence rates

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Answer #1

As per my understanding it should be (a) Incidence rates because it is a measure of the number of new cases ("incidence") per unit of time ("rate") and expressed as person-time.

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