Influencing factors and predictive model of the early postoperative recurrence of colorectal cancer with obstruction

Table 2 Explanation of variable assignment

Variable	Data type	Assignment description
Preoperative CEA	Continuous variable data	Enter actual value
Preoperative SII	Continuous variable data	Enter actual value
TNM stage	Categorical data	0 = Phase I; 1 = phase II; 2 = phase III
Degree of differentiation	Categorical data	0 = High; 1 = moderately; 2 = low
Perineural invasion	Categorical data	0 = Not have; 1 = have
Ki-67 expression	Continuous variable data	Enter actual value

CEA: Carcinoembryonic antigen; SII: Systemic immune-inflammation index; TNM: Tumor, node, and metastasis.