yuk.....this qn is making my head go in circles!
:

 

Cool question, where did you get if from?

So it sounds super difficult, with all the information given... but in fact I think it is super easy.

The ask for the Number needed to treat which equals 1/absolute risk reduction

The risk for both groups is given: 2,3% and 1,3% respectively

so the NNT = 1 / (2,3% - 1,3%) = 1/0,01 = 100

pretty straight forward if I got it correct

 

Cool question, where did you get if from?

The risk for both groups is given: 2,3% and 1,3% respectively

pretty straight forward if I got it correct

why is it 2.3 n 1.3 thats being considered?
ARR is absolute risk of placebo-absolute risk of rx..
.
er... i think i just understood what u meant.

just for clarity, could u put those values into the 2x2 table? (disease x risk), the plus n minus n all..?

 

this is an nbme 12 question so may spoil the assessment for someone the poster should have mentioned it and imo the answer is 2.3 since attributible risk reduction here is 2.3 minus 1.3 divided by 2.3 we get 1 divided by 2.3 as the attributable risk reduction if we inverse this we get 2.3 which is the number needed to treat correct me if i am wrong

 

Thanks for the person posting the thread spoiling an NBME12 questions
My answer 100 is correct

By the way, this question can be answered using google and has also been discussed in this forum before...

http://www.usmle-forums.com/usmle-step-1-forum/39291-nbme-behav.html

 

PLEASE people if youre putting NBME questions on the forum be considerate AND LET US KNOW.... geez....


awesome curacao, i got cold sweat when i saw this question ))
in fact it IS EASY, "its always a TRAP" i have to keep myself repeating this for my exam hahaha, thanks for your explanation in fact it is 100.

 

s0rry guys !!
fr0m next time i will label it as an nbme qn
anyways thanx f0r great ans wid explanati0n

 

Question lingers

Hi guys, I'm brand new. Sorry to dredge this up, but why, if the question asks for a congenital abnormality, do we not include neural tube defect and say NNT = 1/((2.3+.29) - 1.3) = ~80?