Table 1

Point assignment for 4C Mortality Score

Age Groupgroup (years)
 18–49
 50–59+2
 60–69+4
 70–79+6
 80++7
Sex at birth
 Female
 Male+1
Comorbidities*
 0
 1+1
 2 ++2
Respiratory rate (breaths/min)
 <20
 20–29+1
 ≥30+2
Oxygen saturation, room air (%)
 ≥92
 <92+2
Altered mental status†
 No
 Yes+2
Blood urea nitrogen (mg/dL)‡
 <20
 20–39+1
 ≥40+3
C reactive protein (mg/dL)
 <5.0
 5.0–9.9+1
 ≥10.0+2

  • *Comorbidities: High body mass index, cancer, chronic cardiac disease, chronic pulmonary disease, diabetes, liver disease, kidney disease.

  • †Altered mental status is patient-reported symptom, whereas 4C used Glasgow Coma Scale <15.

  • ‡Blood urea nitrogen and C reactive protein units converted from 4C.

  • 4C Mortality Score, Coronavirus Clinical Characterisation Consortium Mortality Score.