WHO CPS among hospitalised patients
| Patient state | Descriptor | Score |
| Hospitalised: moderate disease | Hospitalised; no oxygen therapy | 4 |
| Hospitalised; oxygen by mask or nasal prongs | 5 | |
| Hospitalised: severe disease | Hospitalised; oxygen by non-invasive ventilation or high flow | 6 |
| Intubation and mechanical ventilation with pO2/FiO2≥150 or SpO2/FiO2≥200 | 7 | |
| Mechanical ventilation with pO2/FiO2<150 (SpO2/FiO2<200) or vasopressors | 8 | |
| Mechanical ventilation, with pO2/FiO2<150 (SpO2/FiO2<200) and vasopressors, dialysis or extracorporeal membrane oxygenation | 9 | |
| Dead | Dead | 10 |
Adapted from Marshall et al.34
FiO2, fraction of inspired oxygen; pO2, partial pressure of oxygen; SpO2, arterial oxyhaemoglobin saturation; WHO CPS, WHO Clinical Progression Scale.