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Post-hoc analysis on risk of hospital mortality of patients who underwent prone positioning (PP) during ECMO versus patients managed in supine position (control) in predefined clinically relevant subgroups. Risk of hospital mortality was expressed using OR (points) with 95% CI (error bars) adjusted by robust clustering taking into account the 5 original cohorts of ECMO patients (i.e. clusters). BMI, Body Mass Index; SOFA, Sequential Organ Failure Assessment; MV, mechanical ventilation
