Group comparison by PaO
ORI
Across all time points, PaOIntergroup and intragroup comparison of partial pressure of oxygen (PaO*Abbreviations: ORi - oxygen reserve index; SpO†Independent samples ‡Repeated measures ANOVA.An intragroup evaluation showed a significant difference between time points in the ORi+SpOCorrelation between partial pressure of oxygen (PaOIn the control group, significant differences were observed between the hours 0 and 24, 30, 42, and 48, and between hours 6 and 30, and 42 and 48 (Severe hyperoxia was significantly more frequent in the control group (24.8%) than in the ORi+SpOCorrelation between oxygen reserve index (ORI) and fraction of inspired oxygen (FiOPartial pressure of oxygen (PaO*The number of patients at all time points.†Pearson χ