Epidemiology Question

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Epidemiology Question

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ARJ
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10/03/05 - 12:14 PM

Can anybody help in solving the kaplan question mentioned on page 130 in the epidemiology and ethics section of the kaplan notes.

The question "What is the best estimate of likelihood that this man actually has prostate cancer"????????????????????

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phuluong2k
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10/03/05 - 03:01 PM

It is discussed some where in this forum

ARJ
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10/03/05 - 08:46 PM

Thanks phuluong2k for the explanation. nod

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phuluong2k
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10/03/05 - 11:14 PM

You're welcome smiling face

alenka
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10/04/05 - 09:38 PM

in the matter of fact-it's called-kaplan question. nod

lucky
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12/02/05 - 11:16 AM

arj i 'll try to explain it as best as possible but i dont know how to draw a 2 by 2 table here. anyway here goes.

sens 80%

specif90%

prev is 10%

lets take a sample size of 1000

if prevelance is 10 means 100 have disease .on a 22 table write 100 on + side.

now since sens is 80 then 80 out of 100 r TP and 20 r FN on the left side of table.

specif is 90.so out of the 900 well people 810 will be TN and 90 FP. on the right side of table.

now ppv is the top of the table that is all positives. so 80+90 is 170

ppv=80/170=47

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