# of pts to treat to prevent 1 case

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# of pts to treat to prevent 1 case

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5 Posts

Aneurysm
Forum Newbie

Topics: 3
Posts: 6

03/23/08 - 07:43 PM

What is the formula to calculate:
# of people to be treated to prevent one case (say of osteoporosis)?
Please also mention the name of book that has this formula for reference.
Thanks everyone.
Aneurysm

Dr_Cosme
Forum Junior
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Topics: 7
Posts: 58

03/25/08 - 03:56 PM

NNT (Number Needed to Treat) = 100/Absolute risk reduction

Absolute Risk Reduction = Relative Risk exposed group - relative risk unexposed group

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macintosh
Forum Elite

Topics: 38
Posts: 178

04/02/08 - 08:24 PM

NNT is the inverse of absolute risk reduction, i.e. number needed to treat 1 patient for a given ARR. the formula is

NNT=1/ARR

Aneurysm
Forum Newbie

Topics: 3
Posts: 6

04/04/08 - 07:07 AM

Hi Guys,
Thanks for your reply.
I was reading Step 2 Epidemiology, and it says there that:
NNT=1/incidence rate
Await your comments.
Thanks
Aneurysm

Ig F
Forum Elite
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Topics: 3
Posts: 345

05/17/08 - 05:05 AM

NNT=I/ARR.......i found this in USMLE WORLD.......

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