Choledocholithiasis characteristics with periampullary diverticulum and endoscopic retrograde cholangiopancreatography procedures: Comparison between two centers from Lanzhou and Kyoto

Table 1 Comparison clinical characteristics of choledocholithiasis patient with periampullary diverticulum between Lanzhou and Kyoto

Clinical Item	Lanzhou (n = 829)	Kyoto (n = 241)	P
Age (mean ± SD, yr)	64.6 ± 13.6	75.7 ± 12.1	< 0.001
Gender			0.48
Male	448 (54.0)	124 (51.5)
Female	381 (46.0)	117 (48.6)
Diameter of CBD (mean ± SD, mm)	14.8 ± 5.2	11.6 ± 4.2	< 0.001
Cholecystectomy	15.5 ± 5.2	13.1 ± 4.8	0.18
Gallbladder in situ	14.4 ± 5.1	11.5 ± 4.2	< 0.001
Proportion of CBD stone, n (%)			< 0.001
Single-stone	449 (54.7)	188 (79.7)
Multiple-stone	372 (45.3)	48 (20.3)
Maximum diameter of CBD stone (mean ± SD, mm)	12.2 ± 6.5	8.2 ± 5.3	< 0.001
Diameter (< 2cm), n (%)	718 (86.6)	233 (96.7)	< 0.001
Diameter (≥ 2cm), n (%)	111 (13.39)	8 (3.3)
Concomitant disease, n (%)
Acute cholangitis	153 (18.5)	23 (9.5)	0.001
Gallbladder stone	39 (4.7)	30 (12.5)	< 0.001
Obstructive jaundice	114 (13.8)	1 (0.4)	< 0.001
Acute pancreatitis	39 (4.7)	4 (1.7)	0.03
Pancreatic duct stones	1 (0.1)	0 (0.0)
Past medical history, n (%)
Operation Billroth I	0 (0.0)	3 (1.2)	0.01
Operation Billroth II	5 (0.6)	1 (0.4)	1.00
Cholecystectomy	318 (38.4)	9 (3.7)	< 0.001
Billary tract surgery	34 (4.1)	0 (0.0)	0.001

CBD: Common bile duct.