Table 4.

The OS predictive model of patients with Stage II colorectal cancer

Predictive model	Regression coefficient
Equation	Score = 1.116 × TD + 2.202 × LVI + 3.676 × UPM + 1.438 × LN − 0.493
Variable	TD (poorly-differentiated = 1, well or moderate differentiated = 0)
	LVI (present = 1, absent = 0)
	UPM (present = 1, absent = 0)
	LNs retrieved (<12 LNs = 1, ≥12 LNs = 0)
Risk category	Low risk: Below 0.07 (no recommendation of adjuvant chemotherapy)
	Moderate risk: Between 0.07 and 1.33 (conditional recommendation of adjuvant chemotherapy)
	High risk: Above 1.33 (strong recommendation of adjuvant chemotherapy)

TD: Tumor differentiation; LVI: Lymphovascular invasion; UPM: Uncertain or positive margins; LNs: Lymph nodes; OS: Overall survival.