From: 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 age
Group
Screening for disease
Sensitivity
Specificity
Positive predictive value
Negative predictive value
False positive rate
False negative rate
AMA
Trisomy 21
71.43
80.56
0.80
99.92
19.43
28.57
Non-AMA
50.00
94.92
0.24
99.99
5.08