Table 4.

Predictors of 0 – 3 year mortality derived by Multivariate (proportional hazard) Cox regression analysis.

Variables	B	SE	Wald	Risk Ratio	P-value	95%	C.I.
Time on CPB (per 10 minutes)	0.02	0.00	16.26	0.0001	1.15	1.08	1.23
All vein grafts	1.75	0.55	10.15	0.0014	5.74	1.96	16.82
Cerebrovascular Disease	1.33	0.43	9.82	0.0017	3.79	1.65	8.72
Age (per 10 years)	0.06	0.02	8.28	0.0040	1.63	1.20	1.91
Redo Surgery	1.24	0.55	5.00	0.0254	3.46	1.17	10.26
Congestive Heart Failure	0.91	0.45	4.07	0.0435	2.48	1.03	6.00
Pre-operative Renal Failure	1.34	0.76	3.11	0.0779	3.81	0.86	16.86

95% C.I = 95% confidence interval; CPB = cardiopulmonary bypass;

Predictors are arranged by decreasing Wald statistic