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. 2012 May 15;26(5):664–669. doi: 10.1007/s00540-012-1411-9

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© The Author(s) 2012

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Fig. 2 — Functional residual capacity for PEEP levels studied. **P < 0.01 versus preoperative (pre-op) and opeP0, ⁺⁺ P < 0.01 versus opeP5.1, ^## P < 0.01 versus opeP5.2 pre-induction (pre-ind). P postoperative, FRC measured pre-ind FRC − mask dead space (100 ml)