Impact of preoperative ultrasonography findings on the patency rate of vascular access in Japanese hemodialysis patients

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Table 3 Contribution factors to the patency rate

	Univariate analysis		Multivariate analysis
	Hazard ratio (95 % CI)	p value	Hazard ratio (95 % CI)	p value
Age (per 1 year)	1.02 (1.00–1.04)	0.0607
75 or more years old (vs. <75 years old)	1.72 (1.02–2.85)	0.0440*	2.14 (1.21–3.72)	0.0093*
Female (vs. male)	1.19 (0.71–1.97)	0.502
DM (vs. without DM)	1.86 (1.13–3.07)	0.0145*	1.82 (1.11–3.02)	0.0371*
Body height (per 1 cm increase)	0.98 (0.96–1.01)	0.232
Body weight (per 1 kg increase)	1.00 (0.98–1.02)	0.930
Body mass index (per 1 kg/m² increase)	1.03 (0.97–1.09)	0.345
Systolic blood pressure (per 1 mmHg increase)	1.00 (0.99–1.01)	0.939
Diastolic blood pressure (per 1 mmHg increase)	0.99 (0.97–1.00)	0.132
Duration between operation to puncture (per 1 day)	1.00 (0.99–1.00)	0.487
CV diameter (per 1.0 mm increase)	0.86 (0.59–1.22)	0.402
RA diameter (per 1.0 mm increase)	0.60 (0.34–1.00)	0.0517
Less than 2.0 mm (vs. 2.0 mm or more)	2.76 (1.26–5.37)	0.0133*	2.83 (1.18–6.06)	0.0215*
RA blood flow (per 1.0 ml/min increase)	0.98 (0.96–0.99)	0.0060*	0.28 (0.01–7.23)	0.485
Less than 20 ml/min (vs. 20 ml/min or more)	2.04 (1.24–3.40)	0.0048*	1.21 (0.60–2.62)	0.626
BA diameter (per 1.0 mm increase)	0.78 (0.55–1.10)	0.162
BA blood flow (per 1.0 ml/min increase)	0.99 (0.99–1.00)	0.0041*	0.23 (0.02–2.29)	0.221

CI confidence interval, DM diabetes mellitus, CV cephalic vein, RA radial artery, BA brachial artery
* p value <0.05