CO2 insufflation for potentially difficult colonoscopies: Efficacy when used by less experienced colonoscopists

Table 1 Patient characteristics (n = 114) n (%)

	CO2 group (n = 57)	Air group (n = 57)	P value
Median age, yr (IQR)	65 (59-73)	62 (47-71)	0.107
Females	39 (68)	38 (67)	1.00
Eligibility criteria for difficult cases1
Females with relatively low BMI (< 22)	35 (61)	36 (63)	0.133
Previous abdominal and/or pelvic open surgery	41 (72)	37 (65)	0.546
Males with previously diagnosed left-side diverticulosis	6 (11)	2 (4)	0.271
One or more previous colonoscopies	16 (28)	15 (26)	1.00

¹Some patients had more than one difficult case factor. IQR: Interquartile range; BMI: Body mass index.