Introducing the non-invasive prenatal test for trisomy 21 in Belgium : a cost-consequences analysis : Supplementary material

p. 21Modelling of NIPT Figure 3 presents an overview of the current screening strategy in Belgium. In Figure 4, the current first trimester biochemistry screening and second trimester screening is replaced by NIPT at week 12. In the next part of this supplementary file, we present and explain the three models in detail (current screening, NIPT 2nd line and NIPT 1st line) with inclusion of the number of pregnant women and T21 pregnancies at different moments in the model