Fig. 1

Model Performance of the 7-day versus 30-day Readmission Models. a Receiver operating characteristic (ROC) curves. The original 30-day model had modestly lower discrimination for predicting 7-day versus 30-day readmission (C-statistic of 0.66 vs. 0.69, p ≤ 0.001). Our re-derived 7-day readmission model had similar discrimination as the original 30-day model for predicting 7-day readmissions (C-statistic of 0.66 vs. 0.66, p = 0.38). b Calibration. To predict 7-day readmissions, the new 7-day prediction model had better calibration than the original 30-day prediction model across all quintiles of risk, but risk stratification was similar