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The training curve was obtained through 5-fold cross-validation, where positive controls are PCR-confirmed cases during the pandemic (N=2183) and negative controls are prepandemic patients (N=10,000) from 43 hospitals in the PHD. The training AUROC was 0.91 (95% CI 0.90-0.92). The external validation curve was performed in the external validation data set after training the model on the training data set.
J Med Internet Res 2020;22(12):e24048
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