Table 3.

The different values of pulse oximetry value of patients according to different hypoxemia conditions during the intubation procedure

Values of pulse oximetry	Mild hypoxemia (201–300 mmHg)b		ap-value	Moderate-to-severe hypoxemia (≤200 mmHg)b		ap-value
	NIV cohort	HCO cohort		NIV cohort	HCO cohort
Procedure for oxygenation and ventilation	Non-invasive ventilation	High-flow nasal cannula oxygen		Non-invasive ventilation	High-flow nasal cannula oxygen
Patients included in the analysis	34	35		120	126
At the beginning of preoxygenation	96 ± 2%	95 ± 3%	0.109	94 ± 5%	93 ± 5%	0.118
The lowest value during the intubation procedure	79 ± 3%	78 ± 2%	0.107	77 ± 15%	76 ± 12%	0.084
At the end of preoxygenation	98 ± 5%	95 ± 8%	0.067	96 ± 8%	94 ± 8%	0.052

Variables are reported as mean ± standard deviation (SD)

The Mann-Whitney U-test was performed for statistical analysis

^aComparisons between cohorts

^bPartial pressure of arterial oxygen to fraction of inspired oxygen ratio

A p-value of less than 0.05 was considered significant