Table 2.

Univariate and multivariable analysis of risk factors for mortality (Cox proportional hazards model) in the whole sample

	HR	S.E.	z	p	95 % CI
(a) Univariate analysis
Surgery	0.35	0.11	−3.33	0.001	0.19–0.65
Age >42 years	7.15	2.43	5.81	0.001	3.68–13.91
Female sex	0.39	0.09	−4.02	0.001	0.25–0.62
Cotonary heart disease	4.67	1.52	4.73	0.001	2.47–8.86
Diabetes	5.71	1.31	7.61	0.001	3.54–8.94
(b) Multivariate analysis
Surgery	0.41	0.13	−2.82	0.005	0.22–0.76
Age >42 years	4.35	1.57	4.08	0.001	2.15–8.82
Female sex	0.39	0.09	−4.10	0.001	0.25–0.61
Cotonary heart disease	2.51	0.83	2.75	0.006	1.31–4.81
Diabetes	3.11	0.75	4.69	0.001	1.93–4.99

Hazard ratios (HR, with 95 % CI) and standard errors are indicated, together with effect (z) and significance level