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Table 1 Ordinal scale for illness severity

From: Evaluation of convalescent plasma versus standard of care for the treatment of COVID-19 in hospitalized patients: study protocol for a phase 2 randomized, open-label, controlled, multicenter trial

1. Not hospitalized, no limitation of activities
2. Not hospitalized, limitation of activities
3. Hospitalized, not requiring supplemental oxygen
4. Hospitalized, requiring supplemental oxygen by mask or nasal prongs
5. Hospitalized, non-invasive ventilation or high flow oxygen
6. Hospitalized, intubation and mechanical ventilation or ECMO
7. Death