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Re: Calculation of Risk for DownFrom: Ph Coquel (philippe.coquel@wanadoo.fr)Fri Feb 23 12:12:53 2001
Doc Gyneco said::
> To alter her triple-screen risk you must be sure about statistical Yes, but in UOG 2000;16:402-406, Verdin and all analyse the value of the second trimester ultrasound examination among the women whose fetuses were indicated to be at low risk for chromosomal anomalies on the basis of both first trimester nuchal translucency measurement and second trimester biochemical screening LLR for echogenic bowel is 283 (71 -1133) 95% IC with 2 abnormal karyotype for five fetuses at low risk But the study numbers are relatively small (5500 pregnacies) and 3548 considered negative after bichemical screening (7 abnormal karyotype in this group) ¨ Ph Coquel,MD Annecy, France
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