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st: RE: Number Needed to be Treated (NNT)

From   "Riffenburgh, Robert H CIV" <>
To   <>
Subject   st: RE: Number Needed to be Treated (NNT)
Date   Fri, 3 Aug 2007 09:41:38 -0700

Dear Carlo--
I was away at JSM 2007 in SLC when you wrote this query and just
returned. I have also read the answers to date. If you need NNT
calculations under simple assumptions, you can do them using di more
easily than going to commands designed for other purposes. You were
referred to formulas in the clinical trials literature. More
specifically, you can find the formulas on pp 437-440 in the book
"Statistics in Medicine, 2nd Ed", Robert H Riffenburgh, 2006, Elsevier,
which is sold by Stata. If you don't have the book available, I will be
glad to send you the formulas that include NNT, cost per detection,
number needed to benefit, and confidence interval (assuming normality).
(Use If you have more involved issues in the NNT arena,
please refer to the very helpful comments of others on Tuesday through
Thursday. (My personal thanks to Ronan Conroy for the charming NTN
Bob Riffenburgh

-----Original Message-----
[] On Behalf Of Carlo Lazzaro
Sent: Tuesday, July 31, 2007 8:32 AM
Subject: st: Number Needed to be Treated (NNT) 

Dear Statalisters,

Is there any Stata 9.2 function for calculating the patient number
needed to
be treated (NNT) in order to prevent one case of a given disease?
(Search do
not support this query)

Thanks a lot for Your Kindness and for Your time.

Kind Regards,


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