Table 2. Parameters that correlate with survival of stage 0/I–IV CRC patients ages ≥80 in multivariate analysis.

Parameter	Hazard ratio	95% confidence interval	P value
Age, years
80–84	1.000	−	−
85–89	1.483	1.199–1.828	0.0003
≥90	1.964	1.404–2.695	<0.0001
Stage
0&I	1.000	−	−
II	1.398	1.089–1.795	0.0086
III	2.315	1.761–3.036	<0.0001
IV	6.462	4.500–9.240	<0.0001
Chemotherapy
Yes	1.000	−	−
No	1.355	1.018–1.827	0.0413
Surgery
Yes	1.000	−	−
No	2.605	1.826–3.694	<0.0001

CRC, colorectal cancer.