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Pao2/Fio2 ratio in different types of lung conditions at three PEEP levels. Patients in group N had normal lungs, those in group P had a primary lung disorder, and those in group S had a secondary lung disorder. Values are expressed as mean ± standard deviation. EELV, end-expiratory lung volume; FiO2, inspired oxygen fraction; Pao2, arterial oxygen tension; PBW, predicted body weight; PEEP, positive end-expiratory pressure.
