Comparison between air and carbon dioxide insufflation in the endoscopic submucosal excavation of gastrointestinal stromal tumors

Table 1 Patient characteristics

Group	CO2 insufflation	Air insufflation	P value1
	(n = 30)	(n = 30)
Age, yr, mean ± SD	52.1 ± 5.1	50.9 ± 6.6	0.83
Sex (male/female)	17/13	16/14	0.80
Mean BMI (kg/m2)	21.63	21.79	0.54
Previous surgeries, n (%)
Any prior abdominal surgery	17 (57)	16 (53)	0.80
Cholecystectomy	9 (30)	11 (37)	0.58
Hysterectomy	3 (10)	2 (7)
Liver transplantation	2 (7)	1 (3)
Other2	5 (17)	2 (7)	0.30

¹By χ² for categorical variables and t test for continuous variables;

²Other surgeries include ovarian cystectomy[2], appendectomy[2], laparoscopic gastrectomy[1]. BMI: Body mass index.