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

Table 5 Univariate and multivariate analyses influencing factors for dose of pentazocine

Factors	Univariate analysis				Multivariate analysis
	P value	Odds ratio	95%CI		P value	Odds ratio	95%CI
			Lower limit	Upper limit			Lower limit	Upper limit
Age (less than 65 yr)	0.025	12.429	1.362	113.410	0.033	11.338	1.232	105.219
Gender	0.868	0.872	0.173	4.392
Correct visual selection	0.999	-	-	-
Correct CDE	0.999	-	-	-
Intervention	0.744	1.339	0.231	7.751
Insertion time (more than 22 min)	0.283	2.475	0.473	12.961
Total examination time (more than 80 min)	0.353	2.182	0.421	11.318
CRP level normal	0.834	1.207	0.208	7.012
Serum amylase level normal	0.867	1.164	0.197	6.891
Billroth II and PD	0.582	0.612	0.106	3.521
Previous surgery more than 2 times	0.166	0.305	0.057	1.639	0.313	0.389	0.062	2.431

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