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Table 1 WHO ordinal scale for clinical improvement

From: Statin and aspirin as adjuvant therapy in hospitalised patients with SARS-CoV-2 infection: a randomised clinical trial (RESIST trial)

Patient State Descriptor Scale
Uninfected No clinical and virological evidence of infection 1
Ambulatory No limitation of activities 2
Limitation of activities 3
Hospitalised mild disease Hospitalised, no oxygen therapy 4
Oxygen by mask or nasal prong 5
Hospitalised severe disease Non-invasive ventilation or high-flow oxygen 6
Intubation and mechanical ventilation 7
Ventilation + additional organ support -pressors, ECMO, RRT 8
Dead Death 9
  1. ECMO extracorporeal membrane oxygenation, RRT renal replacement therapy, WHO World Health Organisation