Table 4. Five-year Kaplan-Meier survival probabilities in each score group.

Risk group	Score value	Number of patients	Five-year survival probability
Low risk	0–3	626	0.95 [0.93–0.97]
Moderate risk	4–13	500	0.90 [0.87–0.92]
High risk	14–20	126	0.77 [0.68–0.84]
Very high risk	≥20	114	0.54 [0.43–0.63]
Baseline survival probability formula for low risk group after modelization by quadratic regression: S0(t) = 1–0.00610*time(years) - 0.00050468*time(years)2

Baseline survival probability formula for low risk group after modelization by quadratic regression

S₀(t) = 1–0.00610*time_(years) - 0.00050468*time_(years)²