3. The figure below illustrates a study of 10 immunocompromised individuals. The time period during which

each individual was followed up in the study is indicated with a blue line. The day an individual contracted

influenza while being in the study is indicated with a diamond.

a. Calculate the total person-time contributed by all participants in the study and interpret your result.

To receive full credit, show your calculations and include the population, outcome, and follow-up

period in the interpretation of your results.

b. Calculate the incidence rate of influenza over the 40-day follow-up period and interpret your result.

To receive full credit, show your calculations and include the population, outcome, and follow-up

period in the interpretation of your results.

C.

Calculate the cumulative incidence of influenza over the 40-day follow-up period and interpret your

result. To receive full credit, show your calculations and include the population, outcome, and follow-

up period in the interpretation of your results.