Question: For each or the following situations, indicate the appropriate measure, incidence rate or prevalence rate and the numerical value of the rate?

a) Over a 10 year period, 1,200,474 patients had initial bypass surgery. Of those patients, 900,474 returned for further surgical procedures related to initial bypass within one year of their original bypass surgery. Which is the appropriate measure, incidence rate or prevalence rate? What is the numerical value of the rate?

b) A screening team tested 847 individuals who were between 52 to 85 years of age for cataracts. Of these individuals tested, 54 were determined to have cataracts at the time of the screening.