High-flow oxygen via oxygenating mouthguard in short upper gastrointestinal endoscopy: A randomised controlled trial

Table 1 Characteristics of the patient at baseline (n, %)

Characteristics		SNC (n = 154)	HFMG (n = 138)
Age (median, IQR)		64, 56 to 72	59, 48.5 to 69.5
Male		71, 46.1%	67, 48.6%
Weight, kg (mean, SD)		76.4, 13.6	76.1, 14.8
BMI, kg/m2 (mean, SD)		26.6, 4.1	26.4, 3.9
ASA classification, I/II/III		14/67/73, 9.1%/43.5%/47.4%	16/58/64, 11.6%/42.0%/46.4%
Mallampati class, I/II/III		54/70/30, 35.1%/45.4%/19.5%	48/70/20, 34.8%/50.7%/14.5%
Baseline oximetry, SpO2 (median, IQR)		97%, 95% to 99%	98%, 97% to 99%
Past medical history
	Current smoking history	14, 9.1%	14, 10.1%
	Obstructive sleep apnoea	8, 5.2%	6, 4.3%
	Hypertension	69, 44.8%	46, 33.3%
	Ischemic heart disease	19, 12.3%	9, 6.5%
	Diabetes mellitus	34, 22.1%	33, 23.9%
	Dyslipidemia	36, 23.4%	26, 18.8%
	Chronic obstructive pulmonary disease	8, 5.2%	11, 8%
	Asthma	9, 5.8%	11, 8%
	Cirrhosis	25, 16.2%	34, 24.6%
	Orthotopic liver transplantation	19, 12.3%	25, 18.1%

ASA: American Society of Anesthesiologists; BMI: Body mass index; HFMG: High-flow via oxygenating mouthguard; IQR: Interquartile range; SpO₂: Oxygen saturation; SD: Standard deviation; SNC: Standard nasal cannula.