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Table 3 Comparation of results of prenatal screening

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 High risk Low risk Sum
Trisomy 21 Trisomy 18 ONTD Trisomy 21 Trisomy 18 ONTD
Non-AMA 10,037 (5.09) 559 (0.28) 839 (0.43) 187,064 (94.91) 196,542 (99.72) 196,262 (99.57) 197,101
AMA 2490 (19.55) 165 (1.30) 87 (0.68) 10,249 (80.45) 12,574 (98.70) 12,652 (99.32) 12,739
Sum 12,527 (5.97) 724 (0.35) 926 (0.44) 197,313 (94.03) 209,116 (99.65) 208,914 (99.56) 209,840
  1. AMA advanced maternal age, ONTD Open neural tube defects