FIGURE 1.

Flow diagram of patient enrollment. A sum of 644 patients with or without COVID‐19 were collected from five hospitals in this study. Based on inclusion and exclusion criteria, 204 COVID‐19 patients (298 CT scans) and 311 CAP patients (470 CT scans) were finally recruited for model development. Patients from four hospitals (H1∼4) were used for model development while patients from the fifth hospital (H5) as independent external test data. During model development, large and small datasets were exchanged once from training to validation sets for robustness assessment. CAP, community‐acquired pneumonia; COVID‐19, coronavirus disease 2019; CT, computed tomography; H1∼5, hospital 1∼5; RT‐PCR, reverse transcriptase polymerase chain reaction