Table 6.

Univariate Kaplan–Meier analysis of disease-free survival

Variable	Five-year overall survival	P-value
Age		0.090
60–69 years	49
≥70 years	45
Gender		0.210
Male	51
Female	46
Charlson comorbidity index		0.089
≤2	52
>2	44
ASA score		0.181
I–II	51
III	45
Preoperative CEA level		0.021
<5 ng/mL	58
≥5 ng/mL	41
TNM stage of colorectal cancer		0.032
I–II	54
III	46
Disease-free interval		0.008
<12 months	39
≥12 months	59
Tumor number		0.128
<3	51
≥3	44
Tumor laterality		0.224
Left	52
Right	44

Abbreviations: ASA, American Society of Anesthesiologists; CEA, carcinoembryonic antigen; TNM, tumor-node-metastasis.