Management of choledocholithiasis: Comparison between laparoscopic common bile duct exploration and intraoperative endoscopic sphincterotomy

Table 2 Comparison of clinical outcome and cost between groups A and B

	Group A	Group B	χ2 (Z)	P value
Ductal stone clearance (%)	88	89	0.607	0.436b
Conversion to open surgery (%)	4.4	8.8	0.767	0.381b
Morbidity (%)	6.7	12.3	0.927	0.336b
Operative time(min)	180,130-220a	155,130-210a	(-0.439)	0.661c
Hospital stay(days)	7,6-9a	6,4.5-8a	(-2.046)	0.041c
Postoperative stay(days)	4,3-6a	3,2-5a	(-2.259)	0.024c
Cost (RMB)	11362,10196-14822a	15466,13555-17689a	(-4.822)	0.000c

a: Median, 25%-75% quartile range; b: Chi square test with a likelihood ratio; c: Mann-Whitney test.