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Effect of lung-protective ventilation with lower tidal volumes on the Pao2/Fio2 ratio (normal 400–500 mm Hg) and the Paco2 level (normal 35–45 mm Hg) among patients undergoing surgery. A standardized mean difference (SMD) greater than zero indicates an effect in favour of lung-protective ventilation. CI = confidence interval, Fio2 = fraction of inspired oxygen, Paco2 = arterial partial pressure of carbon dioxide, Pao2 = arterial partial pressure of oxygen, VT = tidal volume.
