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. 2021 Mar 22;11(3):227. doi: 10.3390/jpm11030227

Figure 1.

Figure 1

Classification and regression trees of the whole cohort of study were elaborated through CRT method for World Health Organization (WHO) eight-point classification of severe pneumonia by COVID-19 (namely: (0) no clinical or virological evidence of covid-19 infection; (1) infected without limitations; (2) limitation of activity; (3) hospitalized without oxygen therapy; (4) oxygen by mask or nasal; (5) non-invasive ventilation (NIV) (continuous positive airway pressure (CPAP) or positive bipressure in the airways (BiPAP)) or high-flow oxygen (HFO); (6) intubation with mechanical ventilation (MV) or mask with reservoir; (7) MV or extracorporeal membrane oxygenation (ECMO), support with vasopressors, dialysis/renal replacement therapy; and (8) death. (A) Pie charts represent the proportion of patients who met the WHO 4 (light grey) or not (dark grey) at each node of the tree. IL-6: interleukin 6. (B) Pie charts represent the proportion of patients who met the WHO 5. CRP: c-reactive protein. (C) Pie charts represent the proportion of patients who met the WHO 6. IL-6: interleukin 6; GGT: gamma-glutamyl transferase. (D) Pie charts represent the proportion of patients who met the WHO 7. LDH: lactate dehydrogenase. (E) Pie charts represent the proportion of patients who met the WHO 8. IL-6: interleukin 6.