1.

两组患者的一般资料

Demographic data of the patients in the two groups (Mean±SD or number of cases)

Parameter	Group 1 (n=40)	Group 2 (n=38)	P
Group 1: Preoxygenation with 100% oxygen; Group 2: Without preoxygenation; BMI: Body mass index; ASA-PSC: American Society of Anesthesiologists physical status class; C-L: Cormack-Lehane.
Age (year)	44.1±11.5	44.3±10.9	0.91
Gender (F/M)	17/23	14/24	0.61
Hemoglobin (g/L)	125.7±17.5	126.7±17.2	0.79
Height (cm)	164.9±7.2	165.9±8.1	0.55
Weight (kg)	61.6±9.7	62.9±10.0	0.58
BMI (kg/m2)	22.6±2.8	22.8±2.8	0.74
ASA-PSC (Ⅰ/Ⅱ)	25/15	21/17	0.51
Mallampati Class (Ⅰ/Ⅱ/Ⅲ/Ⅳ)	23/15/2/0	24/9/5/0	0.86
C-L Class (Ⅰ/Ⅱ/Ⅲ/Ⅳ)	20/13/6/1	17/14/7/0	0.72
Smokers (n)	7	7	0.91