Table 3.

Factors associated with patency loss of arteriovenous fistula^a

Parameters	Univariate analysis		Multivariate analysis
	HR (95% CI)	P	HR (95% CI)	P
Age (per 1-yr increase)	1.03 (1.01–1.06)	0.02b	1.02 (1.00–1.05)	0.08
Female (vs. male)	1.27 (0.57–2.63)	0.54	1.21 (0.51–2.65)	0.65
DM (vs. without DM)	0.89 (0.39–1.88)	0.77	0.75 (0.31–1.70)	0.51
Resistance index at 1 wk after surgery of ≥0.65 (vs. <0.65)	3.17 (1.46–6.50)	0.005b	3.01 (1.28–6.97)	0.01b
BA-flow at 1 wk after surgery of <400 ml/min (vs. ≥400 ml/min)	2.02 (0.93–4.14)	0.07	1.56 (0.63–3.74)	0.33
Period from surgery to initial cannulation of ≤14 d (vs. ≥15 d)	0.86 (0.41–1.98)	0.71	1.41 (0.59–3.71)	0.45
Body surface area (per 0.1-m2 increase)	0.90 (0.76–1.07)	0.23
Diameter of RA < 2.0 mm (vs. ≥ 2.0 mm)	0.51 (0.08–1.68)	0.30
Diameter of cephalic vein < 3.0 mm (vs. ≥ 3.0 mm)	1.82 (0.80–4.91)	0.16
RA-flow before operation (per 1-ml/min increase)	1.00 (0.97–1.02)	0.69
BA-flow before operation (per 1-ml/min increase)	1.00 (0.99–1.01)	0.45
Arteriovenous fistula creation after dialysis initiation (vs. before)	0.75 (0.34–1.56)	0.45

CI, confidence interval; DM, diabetes mellitus; HR, hazard ratio; RA, radial artery; BA, brachial artery.

^aOne patient had a basilic vein, not a cephalic vein, and an ulnar artery, not an RA.

^bP < 0.05.