Table 5. Means and standard deviation in the preoperative ultrasound mapping group (n=114).

Doppler Ultrasound		MEAN	SD
Cephalic vein (n=78)	Diameter (cm)	0.37	0.08
	Depth (cm)	0.19	0.09
Basilic vein (n=23)	Diameter (cm)	0.40	0.11
	Depth (cm)	0.64	0.31
Axillary vein (n=13)	Diameter (cm)	0.69	0.14
Radial artery (n=29)	Diameter (cm)	0.23	0.03
	PSV (cm/sec)	52.93	17.50
Brachial artery (n=85)	Diameter (cm)	0.39	0.09
	PSV (cm/sec)	68.00	21.27

SD: standard deviation.