Point out the appropriate measure, incidence rate, prevalence rate and numerical value of the rate.

For each of 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, 1199719 patients had initial bypass surgery. Of those patients, 899719 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 772 individuals who were between 52 to 85 years of age for cataracts. Of these individuals tested, 32 were determined to have cataracts at the time of the screening

Hint to solve the problem: The base is 1, 10, 100, 1,000, 10, 000, 100, 000, 1, 000, 000 1, 000, 000, 000. Try to use a base that will leave as a minimum one none zero number on the left side of the decimal point.