Table 6.

Prognostic factors of overall survival

	HR	95 % CI	p-value
Age	1.09	1.06, 1.13	<0.001
HISS
3–4	ref
1–2	0.11	0.02, 0.57	0.008
AIS presurgery
A	ref
B	0.19	0.02, 1.69	0.137
C	0.16	0.02, 1.30	0.087
D	0.22	0.06, 0.75	0.015
E	0.18	0.06, 0.55	0.023

HR hazard ratio, CI confidence interval, Ref reference category