Table 2.

Comparison of clinical diagnosis, imaging examination and surgery-related information between the two groups

	Non-MRCP group(n = 83)	MRCP group (n = 101)	χ2/Z	P
Biliary related comorbidities
Cholecystitis	73(87.95%)	94(93.07%)	1.423	0.233
CBDS	7(8.43%)	21(20.79%)	5.393	0.020
Cholangitis	3(3.61%)	6(5.94%)	-0.726	0.468
Gallbladder duct stones	2(2.40%)	6(5.94%)	-1.166	0.244
Adenomyomatosis of gallbladder	2(2.40%)	10(9.90%)	-2.042	0.041
Biliary pancreatitis	0	3(2.97%)	-1.579	0.114
Gallbladder polyps	4(4.82%)	5(4.95%)	-0.041	0.967
Mirizzi syndrome	1(1.20%)	3(2.97%)	-0.815	0.415
Abdominal ultrasound findings	83	101
CBDS	7(8.43%)	10(9.90%)	0.117	0.732
Dilation of the common bile duct	6(7.23%)	10(9.90%)	0.410	0.522
Biliary tract variation	0	0
Biliary tract tumors	0	0
LC combined surgery
Common bile duct exploration	6(7.23%)	15(14.85%)	2.618	0.106
Common bile duct incision	6(7.23%)	15(14.85%)	2.618	0.106
T-tube drainage	6(7.23%)	15(14.85%)	2.618	0.106
Preoperative cholecystocentesis drainage	1*(1.20%)	1*(0.99%)	-0.139	0.889
Preoperative ERCP + EST stone extraction	1(1.20%)	7*(6.93%)	-1.890	0.059
LC intraoperative situation
CBDS	6(7.23%)	15(14.85%)	2.618	0.106
Dilation of the common bile duct	6(7.23%)	15(14.85%)	2.618	0.106
Biliary tract variation	1(1.20%)	5(4.95%)	-2.050	0.040
Biliary tract tumors	0	0
Operating time (min)	78.48 ± 49.54	89.26 ± 48.31	-1.488	0.138

Note: Dilated common bile duct: diameter of common bile duct > 6 mm. *One patient in non-MRCP group and one patient in MRCP group underwent LC combined with preoperative percutaneous cholecystocentesis and drainage, common bile duct exploration, choledocholithotomy and T-tube drainage; one patient in the MRCP group underwent LC combined with preoperative ERCP + EST lithotomy, common bile duct exploration, choledochotomy and T-tube drainage