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Fig. 4. —Graph of receiver operator characteristic (ROC) curve for outcome of
death with respect to radiographic scores by day 7 from symptom onset shows
how well model can discriminate between survivors and nonsurvivors. C-index
for percentage of lung opacification = 0.867, C-index for number of zones
opacified = 0.898. ROC curve for percentage of lung opacification = 
,
ROC curve for number of zones with lung opacification = 
.
