Hazard ratio (HR) from Cox regression used to estimate mortality rate ratio

Patients who didn’t make it to the end of follow up (4.8%) were censored or assumed to have survived until end of follow up based on discharge status

Kaplan-Meier survival curves used to track cumulative mortality

Subgroup analysis: five subgroups based on age, sex, level of respiratory support, days since onset, predicted 29-day mortality risk - Estimated rate ratios and risk ratios (both denoted RR) - Mean age 1.1 years higher in DEC group, so adjusted for age - Results presented with and without adjustment