FIGURE 3.

Diagnostic performance of the deep learning (DL) system. a) Receiver operating characteristic curves of the DL system in the training set and the two independent external validation sets. Validation 2-viral is a stratified analysis using the patients with coronavirus 2019 and viral pneumonia in the validation set 2. b) Calibration curves of the DL system in the two external validation sets. c) Area under the curve and distribution of the training set and the two external validation sets.