The primary outcome is all-cause mortality, subdivided by severity of disease at the time of randomisation. The main secondary analyses will assess in-hospital mortality subdivided by initial respiratory support. Further secondary analyses will assess initiation of ventilation in lower-risk patients, and, separately, duration of hospital stay in lower-risk patients (A-B) and in higher-risk patients (C-F).

The primary outcome is all-cause mortality, subdivided by severity of disease at the time of randomisation. The main secondary analyses will assess in-hospital mortality subdivided by initial respiratory support. Further secondary analyses will assess initiation of ventilation in lower-risk patients, and, separately, duration of hospital stay in lower-risk patients (A-B) and in higher-risk patients (C-F).

The primary outcome is all-cause mortality, subdivided by severity of disease at the time of randomisation.

The primary outcome is all-cause mortality, subdivided by severity of disease at the time of randomisation.