Fig. 1.

Prediction performance of the reference and optimized models on readmission within 30 days after hospitalization for COPD, according to readmission outcomes. a The receiver operating characteristic (ROC) curves for predicting overall 30-day readmissions after hospitalization for COPD. There were no material differences in the area-under-curve (AUC) between reference model (AUC, 0.57) and optimized model (AUC, 0.58). b The ROC curves for predicting early readmissions within 7 days after hospitalization for COPD. The addition of social factors to the reference model improved the AUC from 0.57 to 0.63. c The ROC curves for predicting late readmissions during 8–30 days after hospitalization for COPD. The addition of social factors to the reference model improved the AUC from 0.65 to 0.68