Table 2:

(Volume flow data and analysis):

Measured volume flow data from 12 subjects using the Gaussian surface method and the spectral Doppler method. SD = standard deviation, CV = coefficient of variation, Trans = tranducer(s). Each subject had at least 3 Gaussian surface measurements and at least 3 spectral Doppler measurements of the umbilical vein volume flow in their umbilical cord. Four subjects had 4 Gaussian surface measurements and 6 subjects had 4 spectral Doppler measurements. When only 3 measurements were made in a particular category, an “x” is inserted into the empty slot.

Subject	Trans	Gaussian Surface				Mean	SD	CV	Spectral Doppler				Mean	SD	CV
		mL/min				mL/min	mL/min		mL/min				mL/min	mL/min
1	XL14-3	230	246	229	x	235	9.5	0.041	562	959	209	x	577	375.2	0.651
2	X6-1	290	220	240	x	250	36.1	0.144	107	374	417	x	299	167.9	0.561
3	XL14-3	544	209	246	x	333	183.7	0.552	603	285	537	x	475	167.8	0.353
4	XL14-3	186	203	187	x	192	9.5	0.050	94	243	234	x	190	83.5	0.439
5	XL14-3	289	318	417	x	341	67.1	0.197	328	472	370	274	361	83.8	0.232
6	XL14-3	266	217	331	x	271	57.2	0.211	368	111	396	x	292	157.1	0.539
7	XL14-3	122	110	110	x	114	6.9	0.061	166	235	180	187	192	30.0	0.156
8	X6-1/XL14-3	90	83	123	104	100	17.6	0.176	207	113	202	x	174	52.9	0.304
9	X6-1/XL14-3	120	209	138	166	158	38.8	0.245	114	137	191	478	230	168.5	0.732
10	X6-1/XL14-3	218	222	263	x	234	24.9	0.106	313	434	156	585	372	182.0	0.489
11	X6-1/XL14-3	233	335	284	323	294	46.0	0.157	220	856	443	418	484	267.2	0.552
12	X6-1/XL14-3	261	230	218	164	218	40.5	0.185	591	184	572	354	425	193.5	0.455