Table 3.

Multivariate analysis of overall survival.

	Beta coefficient	Type II error	Level of significance	Hazard ratio
Disease-free interval	−0.022	0.007	0.002	0.979 (0.966–0.992)
Age: >65 years	0.977	0.341	0.004	2.657 (1.361–5.184)
Number of metastases	0.673	0.195	0.001	1.960 (1.337–2.874)
Lymph node involvement	1.262	0.468	0.007	3.534 (1.414–8.836)
Size	0.269	0.108	0.013	1.309 (1.059–1.617)
Previous liver metastasis	1.149	0.380	0.003	3.155 (1.497–6.649)