Skip to main content

Table 3 The predictive properties of the 5th and 95th percentiles of each facial ultrasound marker

From: Utility of fetal facial markers on a second trimester genetic sonogram in screening for Down syndrome in a high-risk Thai population

GA

(weeks)

PT (mm)

NBL (mm)

PT/NBL Ratio

NBL/PT Ratio

5th

95th

5th

95th

5th

95th

5th

95th

14

1.06

2.47

3.18

4.74

0.34

0.56

1.80

2.80

15

1.40

2.81

3.75

5.31

0.36

0.57

1.74

2.71

16

1.71

3.11

4.25

5.81

0.37

0.59

1.69

2.63

17

1.99

3.40

4.67

6.23

0.39

0.60

1.66

2.55

18

2.24

3.65

5.02

6.58

0.40

0.62

1.59

2.47

19

2.47

3.88

5.29

6.85

0.42

0.63

1.54

2.40

20

2.66

4.07

5.48

7.04

0.43

0.65

1.50

2.33

21

2.83

4.24

5.61

7.16

0.45

0.66

1.46

2.27

22

2.97

4.38

5.65

7.21

0.46

0.68

1.42

2.21

  1. GA Gestational age (weeks), PT Prenasal thickness, NBL Nasal bone length