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Distribution of ventilatory parameters on the first day of mechanical ventilation. Distribution of positive end-expiratory pressure (PEEP), inspired fraction of oxygen (FiO2), respiratory rate and maximum airway pressure vs tidal volume (VT). Dotted lines (horizontal and vertical) represent cut-off values for each variable. (a) PEEP, (b) FiO2, (c) respiratory rate, (d) maximum airway pressure
