Comparison of two supplemental oxygen methods during gastroscopy with propofol mono-sedation in patients with a normal body mass index

Table 2 Hypoxemia and lowest pulse oxygen saturation during the gastroscopy, and interventions related to hypoxemia and adverse events

	WNJT group (n = 144)	Nasal cannula group (n = 144)	P value
Total occurrence of hypoxemia	3 (2.1)	21 (14.6)	0.000
Hypoxemia	2 (1.4)	19 (13.2)	0.000
Severe hypoxemia	1 (0.7)	2 (1.4)	1.000
Lowest SpO2	98 (97, 99)	96 (93, 98)	0.000
Airway opening maneuvers	4 (2.8)	36 (25)	0.000
Facemask ventilation	0 (0)	4 (2.8)	0.131
Body movement	8 (5.6)	9 (6.3)	0.803
Cough	10 (6.9)	11 (7.6)	0.821
Epistaxis (0/1/2/3)	0/7/0/0 (4.9)	0 (0)	0.022
Sore throat	2 (1.4)	3 (2.1)	1.000

Data are presented as median (interquartile range) or number of patients (percent). SpO₂: Pulse oxygen saturation; WNJT: Wei nasal jet tube.