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Re: Bacteriuria and UTIFrom: Lisa Maria Soule (lsoule@umabnet.ab.umd.edu)Wed Nov 20 11:31:08 1996
On Wed, 20 Nov 1996, Mats Bergstrom wrote:
And the
> lower the true incidence, the higher is the rate of false positives. A minor point (I'm hesitant to post as a lowly student, but I was an epidemiologist before going to medical school, so I'm still a stickler for proper terminology!): The RATE of false positives is related to the specificity of a screening test and is an innate property of the test, unrelated to prevalence. It is predictive value that varies with prevalence - so the NUMBER of false positives will increase with a lower prevalence disease and thus give you lower positive predictive value. Incidentally, I was taught to my surprise today in a pharm lecture that scopolamine is used in obstetric anesthesia. I thought this went out in the dark ages - is it still used? Lisa ****************************************************************************** Lisa M. Soule, MS II "Why walk when you can fly!" University of Maryland -- School of Medicine
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