linaorvos
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Total Population: 1,000,000
Existing HIV Patient: 10,000
New HIV Patients:1,000
Death from HIV:200
What's the incidence of the HIV in this city?
a. 1000/1,000,000
b. 1000/990,000
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| malinda
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A.
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| linaorvos
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This is a Q from Q bank....A was the answer before I saw the options...but it was NOT there...
B is the correct answer....
could anyone please...tell me why...
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| malinda
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incidence is new HIV patients/total population at risk ...B can be the answer only if u subtract the existin HIV patients ie. 10,000 from total population...but why would u do that?may be bcz they are no more at risk of having HIV,they have HIV.
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| reet
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 B is the right choice..
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| druas
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i dont understand why B is the right choice..can anyone plz explain
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| druas
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ISN,T IT THE SAME QUESTION GUYS
In a city with a population of 1,000,000, 10,000 individuals have HIV
disease. There are 1000 new cases of HIV disease and 200 deaths each
year from the disease. There are 2500 deaths per year from all causes.
Assuming no net emigration from or immigration to the city, the
incidence of HIV disease in this city is given by which of the following?
A. 200/1,000,000
B. 800/1,000,000
C. 1000/1,000,000
D. 2500/1,000,000
E. 10,000/1,000,000
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| robin082006
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B is the ans
Kaplan explains that incidence =new cases/population at risk in which population at risk = total population - people who already had disease
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| robin082006
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in many circumstances, because the prevalence of disease is so low so we do not need to subtract the number people with disease from the whole population
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| abissun
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robin then wht wud be the ans for druas ques?
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| robin082006
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for druas it will be 1000/ (1 000 000 - 2500 - 9800). we subtract 2500 deaths and 9800 current cases (=10 000 - 200 deaths from disease).
because there is no choice exactly as above I will choose C because is most suitable
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| abissun
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thnx robins
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| linaorvos
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Thanks guys!!
So, if the choice contains (new cases/population at risk), it's the better answer!
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| mitty
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In kaplan note their is a picture which shows what we need to do to calculate incidence.we always have to ssubstract the number of old cases, deaths by the d/s in question and death due to other causes.
so the answer will be C.
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| linaorvos
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So if the Q is:
Total Population: 1,000,000 ....Existing HIV Patient: 10,000
New HIV Patients:1,000
Death from HIV:200 ....Death from all:2500
Then the most accurate answer of incidence would be: 1000/(1,000,000-1000-2500)
Just want make sure...is this right??
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| mjl1717
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simple verses difficult verses tricky. using the best Galileo mathematics i know: inc. =# of new cases of ds/total # of people at risk-per unit time. {From the numerator i would not subract the death sinc i want incidence} -(for druas q) For the first q the big thing is in the denominator total # of people at risk per unit time.//// MATHEMATICALLY speaking if you have HIV you can not be at risk. I go wih answer-b -{mathematics is like death, its absolute and final}
Edited by mjl1717 on 02/11/06 - 02:52 PM
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| mjl1717
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All I can say is there is a lot of confusion here. Also if someone mentions subtraction please communicate if you mean the top- numerator or bottom- denominator
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