Accuracy of carbon dioxide insufflation for endoscopic retrograde cholangiopancreatography using double-balloon endoscopy

Table 4 Univariate analysis influencing factors for dose of sedation

Factors	Univariate analysis
	P value	Odds ratio	95%CI
			Lower limit	Upper limit
Age (less than 65 yr)	0.241	0.500	0.157	1.594
Gender	0.556	0.708	0.224	2.240
Correct visual selection	0.700	1.286	0.358	4.617
Correct CDE	0.770	0.655	0.039	11.119
Intervention	0.466	0.643	0.196	2.108
Insertion time (more than 22 min.)	0.895	0.917	0.251	3.350
Total examination time (more than 80 min.)	0.797	1.179	0.377	4.125
CRP level normal	0.805	1.167	0.344	3.956
Serum amylase level normal	0.432	0.583	0.152	2.240
Billroth II and PD	0.721	0.808	0.250	2.612
Previous surgery more than 2 times	0.270	0.467	0.120	1.810

CDE: Carbon dioxide insufflation enterography; CRP: C-reactive protein.