Table 2 The number of CXR images for training, validation and testing in differentiating between viral pneumonia, other types of pneumonia and the absence of pneumonia (normal)
Cohorts | Viral pneumonia | Other types of pneumonia | Normal | Total | |
|---|---|---|---|---|---|
Other types of viral pneumonia | COVID-19 pneumonia | ||||
Training | |||||
Gold-standard labels China (CC-CXRI) | 2,506 | 1,248 | 5,015 | 4,389 | 13,158 |
Silver-standard labels United States (CheXpert-P) | 2,840 | − | 5,309 | 4,999 | 13,148 |
Validation | |||||
Gold-standard labels (CC-CXRI) | 169 | 159 | 637 | 554 | 1,519 |
Testing | |||||
Gold-standard labels (CC-CXRI) | 190 | 164 | 630 | 535 | 1,519 |
First external validation | |||||
Gold-standard labels (China cohort) | 142 | 98 | 610 | 1,049 | 1,899 |
Second external validation | |||||
Gold-standard labels (China screening cohort) | 46 | 0 | 220 | 768 | 1,034 |
Third external validation | |||||
Gold-standard labels on COVID-19 (international cohort) | 63 | 132 | 226 | 229 | 650 |
