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Table 1 Means and medians of the area of Wharton's Jelly of the umbilical cord (mm2) in low-risk pregnancies, according to some demographic and obstetric characteristics

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

Characteristics n£ Mean SD Median p-value
Ethnicity      0.7011*
White 1756 110.7 56 106.9  
Non-white 433 109.3 56 107.3  
Age (years)      0.5204*
≤ 29 1254 109.9 56.9 106.4  
> 29 935 111.1 54.8 107.4  
Parity      0.0342*
Nullipara 1168 107.7 55.5 106.1  
≥ 1 1021 113.4 56.4 107.5  
Gestational age (US)      < 0.0001**
13 18 18.3 6.9 18.7  
14 43 23.3 7.5 23.4  
15 59 27.2 8.1 26.5  
16 60 39.5 13.5 35.8  
17 61 44.1 17.0 41.7  
18 60 45.3 18.1 41.4  
19 62 69.3 21.3 66.2  
20 110 67.9 22.1 64.4  
21 102 81.6 32.1 76.6  
22 91 86.7 33.2 80.7  
23 82 95.5 35.1 87.1  
24 60 115.2 35.0 115.6  
25 59 113.5 37.6 114.3  
26 62 120.2 37.2 120.9  
27 62 125.6 36.8 128.9  
28 92 137.0 51.3 136.9  
29 80 137.3 48.4 133.6  
30 91 141.1 49.8 125.3  
31 103 142.0 50.9 137.4  
32 101 142.0 51.3 132.7  
33 95 135.2 56.5 126.8  
34 102 137.9 44.0 136.0  
35 121 141.5 49.4 136.1  
36 102 135.6 45.7 130.4  
37 99 134.2 48.4 129.0  
38 94 134.7 50.7 121.7  
39 59 137.6 44.6 144.8  
40 59 151.9 52.0 143.3  
  1. £ N = 2189 * Mann-Whitney test ** Kruskal-Wallis test US: ultrasound