Table 3.

Univariate analysis for relapse-free survival (Cox proportional hazards regression model)

Factors	HR	95% CI	p Value
Age (<61/≥62 years)	1.125	0.677 to 1.854	0.645
Sex (male/female)	1.073	0.641 to 1.772	0.786
Primary colorectal tumour (rectum/others)	1.237	0.704 to 2.094	0.448
CEA level (≥40/≤40)	1.824	1.054 to 3.042	0.032
Tumour invasion (T4a–b/T3)	1.229	0.728 to 2.035	0.433
Lymph node metastasis (N2/N0–1)	1.753	1.051 to 2.892	0.032
Lymphatic invasion (present/absent)	0.718	0.371 to 1.564	0.380
Venous invasion (present/absent)	1.025	0.452 to 2.943	0.958
Synchronous metastasis (both/lung) (liver/lung)	4.332 2.010	1.284 to 13.148 1.049 to 4.353	0.020 0.034

Underlined values indicate p values of <0.1.

Rectum includes upper and lower rectum and anal canal.

Both: synchronous liver and lung metastases.

CEA, carcinoembryonic antigen.