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

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

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

ISSN: 1742-4755