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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.