Effects of endoscopic sphincterotomy on biliary epithelium: A case-control study

Table 1 Demographic characteristics of the two groups n (%)

	First group	Second group (control)	P value
Patients	25	25
Sex, male/female	11/14	11/14	13
Median age (yr)	71 (range 49-89)	76 (range 44-94)	0.494
ERCP indication
Stent removal	4 (16)	-
Biliary colic	5 (20)	17 (68)	0.013
Biliary pancreatitis	1 (4)	2 (8)
Acute cholangitis	15 (60)	6 (24)
Previous biliary operation1	19 (76)	6 (24)	0.0013
Dilated bile ducts (ultrasound)	14 (56)	18 (72)	0.233
Median time from ES (mo)2	42 (range 8-144)	-

¹Previous biliary operations were laparoscopic or open cholecystectomies;

²This is the median time since prior endoscopic sphincterotomy (ES) that cytology brushing was performed;

³Estimated P values were calculated using the χ² test;

⁴Estimated P value was calculated using the Mann-Whitney test. ERCP: Endoscopic retrograde cholangiopancreatography.