Table 2.

Distribution of specific risk factors in the investigated population (n = 665) n (%)

Risk factors	Indomethacin group (n = 347)	Control group (n = 318)	P value
Age < 50 yr (n = 104)	57/347 (16.4)	47/318 (14.8)	0.559
Female gender (n = 426)	214/347 (61.7)	212/318 (66.7)	0.180
BMI > 25 (n = 362)	191/347 (55.0)	171/318 (53.8)	0.743
Duration of ERCP > 20 min (n = 211)	111/347 (32.0)	100/318 (31.4)	0.880
Non-dilated bile duct (n = 299)	158/347 (45.5)	141/318 (44.3)	0.757
Pancreatic duct opacification (n = 463)	246/347 (70.1)	217/318 (68.2)	0.534
EST biliary (n = 443)	224/347 (64.6)	219/318 (68.9)	0.195
EST pancreatic/double (n = 48)	20/347 (5.8)	28/318 (8.8)	0.130
Difficult cannulation (n = 116)	64/347 (18.4)	52/318 (16.4)	0.111
Gallstone extraction (n = 165)	82/347 (23.6)	83/318 (26.1)	0.461
Bile duct dilatation (n = 22)	11/347 (3.2)	11/318 (3.5)	0.835
Biliary plastic stent placement (n = 75)	35/347 (10.1)	40/318 (12.6)	0.640
Total (n = 2734)	1413/4164 (33.9)	1321/3816 (34.6)	0.520

BMI: Body mass index; EST: Endoscopic sphincterotomy; ERCP: Endoscopic retrograde cholangiopancreatography.