Fig. 2

The ROC Curves for Mortality Prediction Models in Patients with Severe Community-Acquired Pneumonia (SCAP). The ROC curves illustrate the performance of three different models: (1) the APACHE II score (AUC = 0.763, 95% CI 0.625–0.902), (2) the LightGBM model excluding the APACHE II score components (AUC = 0.822, 95% CI 0.740–0.903), and (3) the comprehensive LightGBM model including all features (AUC = 0.842, 95% CI 0.757–0.927).