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Table 4 Percentage distribution of UCUIQ scales across 373 fetuses categorized by 2-week gestational Age Groups

From: True umbilical cord knot detection via active scanning: a prospective study on accuracy and visualization factors

Gestational week

Number of observations

scale 1%

Scale 2%

Scale 3%

11 - 12w

41

9.76%(4/41)

90.24%(37/41)

0.00%(0/41)

13 - 14w

32

15.63%(5/32)

81.25%(26/32)

3.13%(1/32)

15 - 16w

11

54.55%(6/11)

45.45%(5/11)

0.00%(0/11)

17 - 18w

15

86.67%(13/15)

0.00%(0/15)

13.33%(2/15)

19 - 20w

24

95.83%(23/24)

0.00%(0/24)

4.17%(1/24)

21 - 22w

36

86.11%(31/36)

2.78%(1/36)

11.11%(4/36)

23 - 24w

57

91.23%(52/57)

3.51%(2/57)

5.26%(3/57)

25 - 26w

18

83.33%(15/18)

0.00%(0/18)

16.67%(3/18)

27 - 28w

17

64.71%(11/17)

0.00%(0/17)

35.29%(6/17)

29 - 30w

23

69.57%(16/23)

0.00%(0/23)

30.43%(7/23)

31 - 32w

23

17.39%(4/23)

0.00%(0/23)

82.61%(19/23)

33 - 34w

12

16.67%(2/12)

0.00%(0/12)

83.33%(10/12)

35 - 36w

17

0.00%(0/17)

5.88%(1/17)

94.12%(16/17)

37 - 38w

37

2.70%(1/37)

0.00%(0/37)

97.30%(36/37)

39 - 40w

10

0.00%(0/10)

0.00%(0/10)

100.00%(10/10)

  1. cm2 square centimeter, n number, mm millimeter, UC umbilical cord