Summary of validation cohorts
| Author | Numbers of participants with outcome | Numbers of participants without outcome | Percent cohort excluded for missing values | Follow-up time |
| Gong et al5 | 912 | 1107 | 55 | 1 March to 27 May |
| Zhou et al8 | 1900 | 1397 | 26 | |
| Zou et al9 | 418 | 4026 | 0 | |
| Xie et al6 | 885 | 3333 | 5 | |
| Yan et al7 | 848 | 2676 | 21 | |
| Levy et al10 | 616 | 2868 | 22 | |
| Zhang et al12 | Task 1: 814 | Task 1: 2819 | 30 | |
| Task 2: 881 | Task 2: 2327 | |||
| Guo et al13 | 508 | 1751 | 49 | |
| Hu et al14 | 834 | 2869 | 35 | |
| Carr et al11 | 1341 | 3072 | 1 |