Maximum change in Paco 2 and Pao 2 in 30 minute study period (Δmax30Paco 2and Δmax30PaO2).
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Median values (ranges) are shown. Mann-Whitney U tests were used to compare high and low Fio 2 groups. Δmax30Paco 2, no statistically significant differences; Δmax30Pao 2: p < 0.001 for both increases and decreases in amplitude.









