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COVID-19=coronavirus disease 2019; ICU=intensive care unit.
| Severity stage | Case | control | population |
|---|---|---|---|
| 1 Infection | Test positive | Test negative | General population |
| 2 Hospitalization | Hospitalized | Not hospitalized | Confirmed COVID-19 cases |
| 3 Severe symptoms (clinically or radiologically) | Severe symptoms | Non-severe symptoms | Hospitalised COVID-19 cases |
| 4 ICU admittance | Admitted to ICU | Not admitted to ICU | Hospitalised COVID-19 cases |
| 5 death | Death | alive | Hospitalised COVID-19 cases |
