Clinical significance of different periampullary diverticulum classifications for endoscopic retrograde cholangiopancreatography cannulation

Table 5 Successful cannulation for different types of periampullary diverticulum in the three classification groups compared with the non- periampullary diverticulum group

Variable	n/N (%)	Successful cannulation
		OR (95%CI)	P value
Total
Non-PAD	2531/2597 (97.5)	Ref
PAD	953/967 (98.6)	1.87 (1.04-3.37)	0.037
Lobo classification
Non-PAD	2531/2597 (97.5)	Ref
IDP	59/65 (90.8)	0.27 (0.11-0.66)	< 0.001
JPD	894/902 (99.1)	3.07 (1.46-6.46)	< 0.001
Boix classification
Non-PAD	2531/2597 (97.5)	Ref
I	298/306 (97.4)	1.02 (0.48-2.15)	0.27
II	553/556 (99.5)	5.09 (1.59-16.30)	0.009
III	102/105 (97.1)	0.94 (0.29-3.04)	0.33
Li-Tanaka classification
Non-PAD	2531/2597 (97.5)	Ref
I	59/65 (90.8)	0.27 (0.11-0.66)	< 0.001
II	651/655 (99.4)	4.44 (1.61-12.29)	0.01
III	102/105 (97.1)	0.94 (0.29-3.04)	0.49
IV	141/142 (99.3)	3.97 (0.55-28.95)	0.19

Adjusted for age and sex. PAD: Periampullary diverticulum; IDP: Intradiverticular papilla; JPD: Juxtapapillary diverticula; OR: Odds ratio; CI: Confidence interval.