For this problem, note the following chart: Age Group (in years) % of Population
ID: 3306392 • Letter: F
Question
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? NOTE: Do Not assume that the population of Cities B and C are equal to City A
What is the crude rate of influenza in City C? NOTE: Do Not assume that the population of Cities B and C are equal to City A
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.
NOTE: Do Not assume that the population of Cities B and C are equal to City A
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
Explanation / Answer
1)
Crude Influenza Rate: City A: 0.4*2+0.6*70=0.8+42=42.8
2)
Crude Influenza Rate: City B: 0.5*10+0.5*110=5+55=60
3)
Crude Influenza Rate: City C: 0.8*30+0.2*5=24+1=25
4)
Age adjusted Rate for city A: 0.6*2+0.4*70=1.2+28=29.2
Age adjusted Rate for city B: 0.6*10+0.4*110=6+44=50
Age adjusted Rate for city C: 0.6*30+0.4*5=18+2=20
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