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Question 7 In the table shown below, please find the number of cases of disease A and the mid-year population counties X and Y. What

Question 7

In the table shown below, please find the number of cases of disease A and the mid-year population counties X and Y. What was the age-adjusted incidence rate for disease A in county Y per 1,000 person-years? Please use the total population of both county X and county Y as standard (0.545 for under 18 years and 0.455 18+) and write the answer as rate per 1,000 person-years to one decimal place.

County X

County Y

Age group

No. of persons

No. of cases of disease A

Incidence per 1,000

No. of persons

No. of cases of disease A

Incidence per 1,000

<18 years old

1,000

5

5.0

5,000

25

5.0

18 years old

3,000

90

30.0

2,000

60

30.0

Total

4,000

95

23.8

7,000

85

12.1

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