Table 3.

Results of marginal common baseline hazard model, before and after risk adjustment, for endoscopic versus open vein-graft harvesting. Primary analysis of the overall population is presented first, followed by results for the sensitivity analysis.

		Unadjusted			Risk adjusted
Outcomes	Events by Harvest Technique	HR	95% CI	P value	HR	95% CI	P value
Overall population, all 989 sites N=235,394 patients including 122,899 endoscopic (EVH) and 112,495 open vein harvest
Mortality (through 3 years)	EVH 12,429 Open 13,096	0.99	0.95,1.02	0.454	1.0	0.97,1.04	1.000
Death, MI, or revascularization (through 3 years)	EVH 18,419 Open 19,232	1.0	0.97,1.03	1.000	1.0	0.98,1.05	0.344
Wound complication (through 30 days)	EVH 3,654 Open 4,047	0.82	0.78,0.86	<0.001	0.83	0.77,0.89	<0.001
Patients at the 165 sites with sensitivity and specificity > 80% for EVH N=44,423 patients including 25,199 endoscopic(EVH) and 19,244 open vein harvest
Mortality (through 3 years)	EVH 2,474 Open 2307	0.96	0.90,1.03	0.249	0.95	0.89,1.01	0.097
Death, MI, or revascularization (through 3 years)	EVH 3707 Open 3350	1.0	0.94,1.07	.924	1.0	0.94,1.06	0.883
Wound complication (through 30 days)	EVH 778 Open 737	0.80	0.72,0.89	<0.001	0.75	0.64,0.89	<0.001

Abbreviation: CABG, coronary artery bypass grafting; MI, myocardial infarction.