Biostat question

[busy08]

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5+ Year Member
A state with a population of 4,000,000 contains 20,000 people who have disease A ,a fatal neurodegenerative DS. There are 7000 new cases of the disease a year and 1000 deaths attributable to a disease A.There are 40,000deaths per year from all causes.What is the Incidence and Prevalence of the disease?
Answer
I=7000/3,980,000
P=20,000/4,000,000
Can u please explain
Why 1000 deaths are not subtracted from total population in Prevalence and incidence?

 

[immolard]

5+ Year Member
A state with a population of 4,000,000 contains 20,000 people who have disease A ,a fatal neurodegenerative DS. There are 7000 new cases of the disease a year and 1000 deaths attributable to a disease A.There are 40,000deaths per year from all causes.What is the Incidence and Prevalence of the disease?
Answer
I=7000/3,980,000
P=20,000/4,000,000
Can u please explain
Why 1000 deaths are not subtracted from total population in Prevalence and incidence?

the 1000 deaths are a portion of the 20000 with the disease. 1000 die, 19000 live with the disease, neither are at risk.