3.4. Development of Nomogram Risk Stratification Prediction Model
The risk stratification prediction model was developed based on the points of each patient in the training cohort calculated by the nomogram to divide all patients into three prognostic groups (points < 163—low risk, 163 ≤ points < 212—intermediate risk, and points ≥ 212—high risk). The Kaplan–Meier survival curves showed that BCSS among patients belonging to diverse risk groups was accurately differentiated by the risk stratification prediction model (