Table 2. Number of CXR images for training, validation and testing in differentiating among viral pneumonia, other types of pneumonia, and absence of pneumonia (normal).
| Cohorts | Viral pneumonia | |||||
|---|---|---|---|---|---|---|
| Other types of viral pneumonia | COVID-19 pneumonia | Other types of pneumonia | Normal | Total | ||
| Training | “Gold-standard labels” China (CC-CXRI) | 2,506 | 1,248 | 5,015 | 4,389 | 13,158 |
| “Silver-standard labels” US (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 | |
| External validation “Gold-standard labels” |
142 | 98 | 610 | 1,049 | 1,899 | |
| Population Study “Gold-standard labels” |
46 | 0 | 220 | 768 | 1,034 | |
| International cohort “Gold-standard labels” on COVID-19 |
63 | 132 | 226 | 229 | 650 | |