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.
Fig: 1