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Table 2 Estimated values of percentiles of the area of Wharton's Jelly (mm2), according to gestational age

From: Area of Wharton's jelly as an estimate of the thickness of the umbilical cord and its relationship with estimated fetal weight

GA-US

p10

p50

p90

n

13

8.81

16.30

30.15

18

14

11.52

21.27

39.30

43

15

14.70

27.13

50.08

59

16

18.34

33.84

62.43

60

17

22.39

41.31

76.19

61

18

26.79

49.41

91.14

60

19

31.44

57.99

106.95

62

20

36.23

66.83

123.25

110

21

41.05

75.71

139.63

102

22

45.77

84.41

155.68

91

23

50.27

92.72

171.00

82

24

54.46

100.44

185.23

60

25

58.24

107.41

198.09

59

26

61.56

113.53

209.37

62

27

64.38

118.73

218.95

62

28

66.68

122.97

226.77

92

29

68.48

126.28

232.88

80

30

69.79

128.71

237.36

91

31

70.68

130.35

240.39

103

32

71.20

131.30

242.15

101

33

71.41

131.69

242.87

95

34

71.39

131.66

242.80

102

35

71.22

131.34

242.21

121

36

70.97

130.88

241.36

102

37

70.71

130.41

240.52

99

38

70.51

130.08

239.97

94

39

70.45

130.02

239.97

59

40

70.58

130.37

240.83

59

  1. Equation: Log10(WJ) = -1.4307 + 0.2986*GA - 0.008*GA2 + 0.00008*GA3
  2. GA-US: gestational age according to ultrasonography.