Carbon Dioxide Insufflation in Routine Colonoscopy Is Safe and More Comfortable: Results of a Randomized Controlled Double-Blinded Trial

Table 3

Pain sensation assessed by VAS Score.

Time	Insufflation	% (𝑛 = absolute numbers)				𝑃 value
		VAS 0	VAS 1-2	VAS 3–5	VAS 6–10
End	CO2	59 (65)	24.5 (27)	14.5 (16)	2 (2)	.94
	Air	57.7 (63)	23 (25)	16.5 (18)	2.8 (3)
Discharge	CO2	73.6 (81)	14.5 (16)	10.9 (12)	0.1 (1)	.23
(15–30 min)	Air	64.2 (70)	22 (24)	8.3 (9)	5.5 (6)
1 h	CO2	68.8 (55)	22.5 (18)	8.8 (7)	0	<.0001
	Air	36.4 (32)	34 (30)	18.2 (16)	11.4 (10)
3 h	CO2	72.2 (57)	21.5 (17)	6.3 (5)	0	.015
	Air	51.1 (45)	28.4 (25)	14.8 (13)	5.7 (5)
6 h	CO2	73.8 (59)	20 (16)	6.2 (5)	0	.53
	Air	66 (58)	22.7 (20)	10.2 (9)	1.1 (1)
24 h	CO2	87.5 (70)	7.5 (6)	5 (4)	0	.67
	Air	86.4 (76)	11.4 (10)	2.3 (2)	0