Laparoscopic cholecystectomy plus common bile duct exploration for extrahepatic bile duct stones and postoperative recurrence-associated risk factors

Table 4 Results of univariate analysis

	Recurrence group (n = 13)	Non-recurrence group (n = 69)	χ2	P value
Sex
Male	6	29
Female	7	40	0.076	0.783
Age
≤ 65 years old	3	36
> 65 years old	10	33	3.713	0.054
Stone diameter
≤ 10 mm	6	39
> 10 mm	7	30	0.475	0.491
Number of stones
Single	6	36
Multiple	7	33	0.159	0.690
Disease course
≤ 2 years	11	46
> 2 years	2	23	1.663	0.197
Sphincter of Oddi function
Normal	5	53
Abnormal	8	16	7.771	0.005
Treatment scheme
Open choledocholithotomy plus laparoscopic or open cholecystectomy	10	30
Laparoscopic cholecystectomy plus common bile duct exploration	3	39	4.897	0.027