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Inspiratory Pel/V curves recorded from PEEP 15 to 0 cm H2O and expiratory Pel/V curves recorded from 50 cm H2O; average in each group at 0, 16, and 24 h. Inspiratory curves showed significant differences related to starting pressure over the full pressure range apart from LP at 0 h and in HP at 24 h (two-way analysis of variance).
