Table 1 Different Stages of a Patient

8

Death

7

Ventilation with Additional Organ Support (ECMO^a)

6

Intubation and Mechanical Ventilation

5

Non-invasive Ventilation or High-flow Oxygen

4

Oxygen by Mask or Nasal Prongs

3

Hospitalized; No Oxygen Therapy

2

Limitation of Activities

1

No Limitation of Activities