Table 2:

Differences of area between internal jugular vein and vertebral vein in supine and standing positions

	Area, cm2a
	Supine Position	Standing Position
IJV right	0.42 ± 0.40	0.07 ± 0.06
IJV left	0.41 ± 0.25	0.07 ± 0.06
Total	0.83 ± 0.56	0.14 ± 0.09
VV right	0.02 ± 0.01	0.02 ± 0.01
VV left	0.06 ± 0.25	0.02 ± 0.01
Total	0.08 ± 0.25	0.03 ± 0.02
IJV + VV total	0.91 ± 0.61	0.17 ± 0.09

^aMean ± SD.