Table 2.

The four clinical factors that are examinedᅟ

Factor	Hazard ratio	95% CI	p value
Age	0.992	0.841–1.170	0.924
Preoperative Pro-GRP	2.108	0.287–15.510	0.464
Interval from the first visit to operation	6.393	1.042–39.220	0.045
Operative procedure	10.06	1.141–88.75	0.037

The statistical significance was tested by multivariate Cox hazards models

CI confidence interval