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Reasons for (& numbers of) exclusions from the final analysis. PEEP: positive end-expiratory pressure. Observations with missing PEEP were excluded because PEEP is the primary exposure variable. Observations with missing cardiac index were excluded because cardiac index is the primary outcome variable. Observations with missing FiO2 or PaO2 were excluded because PF ratio could not be calculated for these observations, so a diagnosis of ARDS could not be determined.
