Table 2.

Patency, infection, aneurysm, and intervention rate by graft type

Period	Total Patients (n = 4402)		Externally Supported (n = 990)		Nonsupported (n = 3412)		P
	Casesa	%	Casesa	%	Casesa	%
Primary patency rate
1 year	4402	35.8	990	49.4	3412	31.9	<0.0001
2 years	1398	20.6	442	31.6	956	17.4	<0.0001
3 years	471	12.9	157	20.2	314	10.8	<0.0001
Infection rate
1 year	4402	17.3	990	13.6	3412	18.3	0.0006
2 years	3630	26.9	853	22.8	2777	28.1	0.0009
3 years	2488	33.7	588	28.7	1900	35.2	0.0003
Aneurysm rate
1 year	4402	0.8	990	0.5	3412	0.9	0.2493
2 years	4341	1.1	978	0.6	3363	1.2	0.1318
3 years	3281	1.3	740	0.6	2541	1.6	0.0592
Intervention in first year (times)
PTA							<0.0001
0	3748	85.1	887	89.6	2861	83.9
1	443	10.1	82	8.3	361	10.6
2	116	2.6	15	1.5	101	3.0
≥ 3	95	2.2	6	0.6	89	2.6
Revision of AVG							0.0770
0	4095	93.0	936	94.6	3159	92.6
1	268	6.1	49	5.0	219	6.4
≥ 2	39	0.9	5	0.5	34	1.0
Removal of AVG							0.3780
0	4286	97.4	960	97.0	3326	97.5
≥1	116	2.6	30	3.0	86	2.5

PTA, percutaneous transluminal angioplasty.

^aThe case number and percentage in each year are calculated using the life table analysis.