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Table 2 Optimism-corrected calibration and discrimination indices of the prognostic model for each of the outcomes. The 95% bootstrapped confidence intervals are presented within parenthesis

From: Development of a prognostic model of COVID-19 severity: a population-based cohort study in Iceland

Indexes Urgent care visit Hospitalization Intensive care unit admission or death
C-statistic 0.793 (0.789 to 0.797)
Negalkerke’s R2 0.234 (0.227 to 0.242)
Calibration intercept -0.043 (-0.064 to -0.023) -0.063 (-0.094 to -0.033) -0.098 (-0.155 to -0.042)
Calibration slope 0.973 (0.963 to 0.983)
Brier score 0.092 (0.091 to 0.093) 0.039 (0.038 to 0.039) 0.010 (0.010 to 0.010)
Emax 0.014 (0.008 to 0.020) 0.018 (0.010 to 0.027) 0.027 (0.013 to 0.041)
  1. Emax is the maximum absolute difference between the predicted probabilities of the prognostic model and the weighted scatterplot smoothing (LOWESS) calibrated probability