Each of the items (proportion of patients who suffer death, need for mechanical ventilation and development of respiratory distress) separately on days +7, +14 and +30.;Proportion of patients who present death, need for mechanical ventilation or respiratory distress (Pa02 / FiO2 <300 or baseline O2 saturation ≤93%) on days +7, +14 and +30.

Each of the items (proportion of patients who suffer death, need for mechanical ventilation and development of respiratory distress) separately on days +7, +14 and +30.;Proportion of patients who present death, need for mechanical ventilation or respiratory distress (Pa02 / FiO2 <300 or baseline O2 saturation ≤93%) on days +7, +14 and +30.