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Table 2 COVID-19 disease severity scale

From: Microglia activation and neuronal alterations in retinas from COVID-19 patients: correlation with clinical parameters

Scores

Parameters

PaFI (PaO2/FiO2)

SOFA

DD (ng/mL)

 + 0 point

 > 400

 ≤ 3

– 

 + 1 point

300–400

– 

– 

 + 2 points

200–299

3–5

 > 10,000

 + 3 points

 < 200

 > 5

– 

  1. PaFI = partial pressure of arterial blood oxygen/fraction of inspired oxygen ratio; PaO2 = partial pressure of arterial blood oxygen; FiO2 = fraction of inspired oxygen; SOFA = sequential organ failure assessment; DD = D-dimer
  2. No point was added if patients had a PaFI > 400 or SOFA ≤ 3. One point was added if they presented a PaFI between 300 and 400. If the PaFI was between 200 and 299, SOFA values were between 3 and 5 or D-dimer was > 10,000, 2 points were assigned for each. The absolute value of severity for each patient was obtained by adding the score for each parameter present. The score range was between 0 and 7 points: mild disease included patients with a score between 0 and 3, moderate disease was considered with a score of 4 points, and severe disease included patients with a score superior to 4 points