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try nbme. EXpalin

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nadiabarati

06/26/06 - 07:12 AM

The prevalence of a disease is half as great in town A than it is in town B, but the incidence of the disease is no different in town A than it is in town B. Which of the following best explains these findings?

A) The case fatality rate is twice as high in town A.
B) The duration of the disease is twice as long in town B.
C) The number of new cases in town A is twice as many as those in town B.
D) People in town A use medical care facilities half as often as those in town B.
E) The proportion of asymptomatic cases is twice as much in town B than in town A

Diego Casali
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06/26/06 - 08:00 AM

The correct answer is B.

P = I * D.

If Incidence A = Incidence B

and

2 * Prevalence A = Prevalence B,

then 2 * Duration A = Duration B.

Please, correct me if I am wrong!

robin082006
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06/26/06 - 08:03 AM

Exactly

B

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Cedrick
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07/08/06 - 05:57 PM

So more new ones in town A

and the duration longer in town B

ok thanks for the concept

Chioce.-B

Cedrick
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07/08/06 - 05:59 PM

The key is "Prevalence"

pranav06
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08/01/06 - 04:47 AM

I remember from audi lectures that u cannot measure duration.
i go with D .correct me

young_doc
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08/01/06 - 02:46 PM

Cedrick wrote:
So more new ones in town A

and the duration longer in town B

ok thanks for the concept

Chioce.-B

How is there more new ones in Town A if the incidence is said to be the same in both Towns???

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dr_bilalahmad
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08/06/06 - 03:08 PM

i ll prefer (A) if case fatality rate is twice then prevelance will be half in town A.because mortality leads to decreased prevelance.

fongch
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08/09/06 - 11:49 AM

I go with A.

jsknetsdude
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09/17/06 - 05:32 AM

#10

B <-- No contest ..

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Slacker
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09/20/06 - 12:57 PM

#11

This questions simply is trying to test if u know how incidence and duration affects Prevalance

Prevalance = incidence x duration

ans b

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