Lymph node dissection does not affect the survival of patients with tumor node metastasis stages I and II colorectal cancer

Table 2 Cox regression analysis of overall survival of T1 patients with colorectal cancer

Risk factors	Univariate analysis		Multivariate analysis
	HR (95%CI)	P value	HR (95%CI)	P value
Age (years)	1.045 (1.017-1.134)	0.010a	1.075 (1.019-1.134)	< 0.01a
Sex (male/female)	0.592 (0.185-1.894)	0.377
BMI (kg/m2)	0.814 (0.662-1.001)	0.052
T2DM (yes/no)	2.696 (0.845-8.605)	0.094
Tumor location (colon/rectum)	2.109 (0.734-6.060)	0.166
Surgical history (yes/no)	0.467 (0.104-2.087)	0.319
Smoking (yes/no)	0.920 (0.307-2.759)	0.881
Drinking (yes/no)	1.046 (0.348-3.140)	0.936
Hypertension (yes/no)	0.852 (0.236-3.068)	0.806
Tumor size (≥ 5 cm/< 5 cm)	3.418 (1.134-10.299)	0.029a	3.635 (1.210-10.917)	0.021a
Lymph nodes	0.989 (0.906-1.079)	0.807
Overall complications (yes/no)	1.227 (0.381-3.944)	0.732

^aP < 0.05.

HR: Hazard ratio; CI: Confidence interval; BMI: Body mass index; T2DM: Type 2 diabetes mellitus.