There are 10,000 individuals in City A, which is located in Massachusetts. Eight young individuals and 420 old individuals develop the flu over the course of a year.
Use these data to calculate the crude influenza rate per 1,000 individuals per years in City A.
What is the crude rate of influenza in City B?
What is the crude rate of influenza in City C?
Calculate an age-adjusted influenza rate for each of the cities. Use the age distribution for the State of Massachusetts (shown in the table) as the standard.