Table 2. Association of unassisted primary AVG failure with pre-existing vascular abnormalities.

Variable	Unassisted primary AVG Failure		p-value
	Frequency *	HR (95% CI)
Arterial intimal thickness
≥10 μm	28/41 (68%)	0.72 (0.40-1.27)	0.2
<10 μm	23/32 (72%)	1.00 (reference)	--
Venous intimal thickness
≥10 μm	17/25 (68%)	0.64 (0.37-1.10)	0.1
<10 μm	38/51 (74%)	1.00 (reference)	--
Arterial medial fibrosis
≥70%	14/23 (61%)	0.58 (0.32-1.06)	0.6
<70%	34/45 (76%)	1.00 (reference)	--
Arterial calcification
≥10%	11/18 (61%)	0.68 (0.37-1.31)	0.3
<1 0%	36/48 (75%)	1.00 (reference)	--

AVG, arteriovenous graft.

^*Given as n/N (%)