Fig. 3
From: Prognostic models for COVID-19 needed updating to warrant transportability over time and space
Temporal and geographic validation: Performance of COPE and NOCOS for predicting the need for ICU admission (NL) or mechanical ventilation (NYC) in second-wave patients. Calibration plots of patients who were admitted since September 2020 in 4 NL hospitals and 12 NYC hospitals. Temporal validations of COPE and NOCOS are in panels A and C, respectively. Geographic validations of COPE and NOCOS are in panels B and D, respectively. n is number of patients; a = calibration intercept (0 is perfect); b = calibration slope (1 is perfect); c = AUC (0.5 is useless; 1 is perfect); mb.c = model-based AUC