FIGURE 1.
a) Study flow chart. b) 7-day intubation-free survival. #: noninvasive ventilation (NIV) and alveolar hypoventilation defined as arterial carbon dioxide tension ≥45 mmHg; ¶: five intubations and three deaths; two of the deaths occurred in the two “do not intubate” patients; +: there were six patients with “do not intubate” decisions, none of whom died (p=0.036 versus controls; Fisher's exact test). COVID-19: coronavirus disease 2019; CT: computed tomography; SpO2: peripheral oxygen saturation; CPAP: continuous positive airway pressure.