Fig. 8

Calibration curves of the radiomics nomogram for predicting the disease progression of COVID-19 pneumonia in validation set (A) and test set (B). The y-axis represents the probability of COVID-19 pneumonia becoming severe, and the x-axis represents the predicted risk. The dashed line was the reference line where an ideal nomogram would lie. The dotted line was the performance of the radiomics nomogram, while the solid line corrected for any bias in the radiomics nomogram. MAE is 0.04 in the validation set and 0.075 in the test set