For this problem, note the following chart:
|
Age Group (in years)
|
% of Population in Age Group
|
Influenza Rate per 1,000 person-years
|
|
|
CITY A
|
CITY B
|
CITY C
|
Massachusetts
|
CITY A
|
CITY B
|
CITY C
|
|
YOUNG
|
40%
|
50%
|
80%
|
60%
|
2
|
10
|
30
|
|
OLD
|
60%
|
50%
|
20%
|
40%
|
70
|
110
|
5
|
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.