Table 4.

Preoperative arterial and venous diameters by patient subgroup

Parameter	Age ≥65 Yr	Age <65 Yr	P
Forearm fistula (mm)
artery diameter	2.7 ± 0.5	2.6 ± 0.5	0.770
vein diameter	3.0 ± 0.5	3.0 ± 0.4	0.690
Upper arm fistula (mm)
artery diameter	4.8 ± 1.1	5.2 ± 1.2	0.280
vein diameter	4.3 ± 1.1	4.8 ± 1.5	0.100
Female	Male
Forearm fistula (mm)
artery diameter	2.4 ± 0.4	2.8 ± 0.5	0.001
vein diameter	3.1 ± 0.4	3.0 ± 0.4	0.240
Upper arm fistula (mm)
artery diameter	4.8 ± 1.2	5.4 ± 1.0	0.008
vein diameter	4.6 ± 1.6	4.6 ± 1.2	0.940