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Erschienen in: Archives of Gynecology and Obstetrics 3/2007

01.09.2007 | Original Article

Are nuchal translucency, pregnancy associated plasma protein-A or free-β-human chorionic gonadotropin depending on maternal age? A multicenter study of 8,116 pregnancies

verfasst von: Peter Schmidt, Michael Pruggmayer, Andrea Steinborn, Cordula Schippert, Ismini Staboulidou, Peter Hillemanns, Alexander Scharf

Erschienen in: Archives of Gynecology and Obstetrics | Ausgabe 3/2007

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Abstract

Introduction

First-trimester screening according to Nicolaides uses maternal age to obtain a common background risk for trisomy 21. The likelihood ratios by nuchal translucency, free β-human chorionic gonadotropin and pregnancy-associated plasma protein-A are not with respect to maternal age. It was the aim of this study to investigate if likelihood ratios should better take care of it.

Materials

Pearson’s correlation and different models of regression analysis had been performed on the results of 8,116 first-trimester screenings. The total number of pregnancies was subdivided into three subgroups of healthy fetuses (n = 8,038); fetuses with Down’s syndrome (n = 46) and fetuses with other genetic abnormalities (n = 32). Statistical testing was applied to each of the three groups.

Results

Strong independence from maternal age could be found for each of the first-trimester screening measurement parameter, as well for healthy and as for affected fetuses. Neither Pearson’s test nor nonlinear regression models could detect a correlation. Accordingly significance of Pearson’s test is not given.

Discussion

First-trimester screening would not be improved by considering the maternal age in the calculation of the likelihood ratios. Therefore the currently used algorithm is adequate. According, to the results, it seems to be proper as well to disregard the maternal age in newer test strategies advanced first-trimester screening (AFS) at all.
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Metadaten
Titel
Are nuchal translucency, pregnancy associated plasma protein-A or free-β-human chorionic gonadotropin depending on maternal age? A multicenter study of 8,116 pregnancies
verfasst von
Peter Schmidt
Michael Pruggmayer
Andrea Steinborn
Cordula Schippert
Ismini Staboulidou
Peter Hillemanns
Alexander Scharf
Publikationsdatum
01.09.2007
Verlag
Springer-Verlag
Erschienen in
Archives of Gynecology and Obstetrics / Ausgabe 3/2007
Print ISSN: 0932-0067
Elektronische ISSN: 1432-0711
DOI
https://doi.org/10.1007/s00404-007-0342-4

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