Fig. 3From: Prone position versus usual care in hypoxemic COVID-19 patients in medical wards: a randomised controlled trialProbability of intubation or death using time-to-event analysis. Abbreviations HR, hazard ratio; SpO2, oxygen saturation measured by pulse oximetry. Note that the y axis is truncated at 0.6 to make the curves easily distinguishable. Groups were compared by Cox proportional hazards analysis (see Additional file 2, page 8)Back to article page