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PEEP variability. (a) Variability of median PEEP levels between patients receiving a constant PEEP ≤2 cm H2O (control) or individualised PEEP (PEEPmaxCrs or PEEPPtp_ee); and (b) variability of PEEP levels within patients throughout surgery measured by the PEEP coefficient of variation (CVPEEP) for all PEEP levels used for each individual. (∗∗P≤0.01667 in post hoc comparison of respective group compared with control).
