I am hoping for a little statistical guidance with the 95% CI around an
NNT.
Here are the specifics I am working with: The CER is 0.8, the EER is
0.585, so the ARR is 0.215. The CI around the ARR is -0.00256 to 0.433.
So far this makes sense to me. Now, the NNT = 4.65, but taking 1/ARR for
the confidence limits, I get a 95% CI on my NNT of -390 to 2.3. This
doesn't even include my value of 4.65, and doesn't intuitively make sense.
What am I doing wrong?
Julie Brown, MD
Pediatric Emergency Medicine Fellow, box CH-04
Children's Hospital and Regional Medical Center
Seattle, WA 98105
e-mail: [log in to unmask]
fax: 206 527 3892
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