Table 5.

Correlation analysis

Correlation analysis	Pearson’s coefficient	p-value
OI and OSI (ICU admission)	0.42	<0.001*
OI and OSI (6-hour)	0.65	<0.001*
OI and OSI (12-hour)	0.65	<0.001*
OI and OSI (24-hour)	0.67	<0.001*
OSI ICU and P/F ratio_ICU	−0.30	0.01*
OSI 6h and P/F ratio 6h	−0.45	<0.001*
OSI 12h and P/F ratio 12h	−0.30	0.008*
OSI 24h and P/F ratio 24h	−0.33	0.01*
Preoperative Brixia
P/F ratio intraoperative	0.14	0.204
P/F ratio post CPB	0.02	0.876
ICU admission Brixia
P/F ratio post CPB	−0.03	0.779
P/F ratio ICU admission	0.15	0.159
P/F ratio 6 hour	−0.10	0.366
P/F ratio 12 hour	−0.14	0.202
P/F ratio 24 hour	−0.16	0.164
POD 1 Brixia
P/F ratio first ICU	0.06	0.564
P/F ratio 6 hour	0.02	0.855
P/F ratio 12 hour	−0.15	0.161
P/F ratio 24 hour	−0.33	0.004*
P/F ratio 48 hour	−0.09	0.560

^*Represents statistical significance

Abbreviation: CPB, cardiopulmonary bypass; OI, oxygenation index; OSI, oxygenation saturation index; P/F ratio, PaO₂/FiO₂ ratio