Table 4.

Prevalence of IEL-adjacent collagen with continuous circumferential ring in samples with ≥75% circumferential cross-sections (n=426) by baseline attributes

Factora	Present		Absent		P Value
	N	N (%)	N	N (%)
Female	129	66 (51.2)	297	153 (51.5)	0.95
Black	183	89 (48.6)	237	128 (54.0)	0.27
Diabetes prevalence	252	141 (56.0)	174	78 (44.8)	0.02
Cardiovascular disease	230	130 (56.5)	196	89 (45.4)	0.02
Coronary artery disease	118	68 (57.6)	308	151 (49.0)	0.11
Cerebrovascular disease	64	38 (59.4)	362	181 (50.0)	0.17
Venous thromboembolic disease	29	18 (62.1)	397	201 (50.6)	0.23
Peripheral arterial disease	64	37 (57.8)	362	182 (50.3)	0.27
Tobacco use	244	137 (56.2)	180	81 (45.0)	0.02
On dialysis at time of surgery	274	137 (50.0)	152	82 (54.0)	0.43
Forearm fistula	99	33 (38.4)	327	181 (55.4)	<0.001
Upper-arm fistula: basilic or brachial vein			141	65 (46.1)
Upper-arm fistula: cephalic vein			186	116 (62.4)
				P=0.003b

^aSee Table 1 footnotes for specific factor definitions.

^bFor comparison of cephalic vein upper-arm fistulas to pooled basilic and brachial vein upper-arm fistulas.