Fig. 1From: New cut-off values for screening of trisomy 21, 18 and open neural tube defects (ONTD) during the second trimester in pregnant women with advanced maternal ageAUC of maternal free β-hCG MoM, AFP MoM and risk value of Trisomy 21 for Trisomy 21 in ROC curves. a AUC of AMA; b AUC of non-AMABack to article page