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Re: risk for down syndromeFrom: R L Meisel (rmeisel@mac.com)Fri Nov 29 19:33:28 2002
>le 29/11/02 9:22, Patrizia : > >> the question is: do you know how to calculate the sequential risk? > >You need the likelihood ratio from NT, first trimester serum screening and >second trimester serum screening. > >To respect the BAYES' rule, you have to multiply the pre test risk (1:411) >by the 3 likelihood ratios to calculate the post-test risk. > I calculated these from the given numbers in the original message and the cumulative risk is 1/2977
-- Best Wishes, R L Meisel, MD
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