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

Table 4 Difficult cannulation for different types of periampullary diverticulum in the three classification groups compared with the non- periampullary diverticulum group

Variable	n/N (%)	Difficult cannulation
		OR (95%CI)	P value
Total
Non-PAD	317/2597 (12.2)	Ref
PAD	108/967 (11.2)	0.86 (0.68-1.09)	0.21
Lobo classification
Non-PAD	317/2597 (12.2)	Ref
IDP	15/65 (23.1)	2.04 (1.13-3.68)	0.006
JPD	93/902 (10.3)	0.79 (0.61-1.01)	0.001
Boix classification
Non-PAD	317/2597 (12.2)	Ref
I	38/306 (12.4)	0.98 (0.68-1.40)	0.73
II	57/556 (10.3)	0.78 (0.58-1.05)	0.21
III	13/105 (12.4)	0.97 (0.53-1.75)	0.85
Li-Tanaka classification
Non-PAD	317/2597 (12.2)	Ref
I	15/65 (23.1)	2.04 (1.13-3.68)	0.004
II	68/655 (10.4)	0.80 (0.60-1.06)	0.13
III	13/105 (12.4)	0.97 (0.53-1.75)	0.91
IV	12/142 (8.5)	0.62 (0.34-1.13)	0.06

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