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

Table 1 Baseline data

	Control group (n = 40)	Observation group (n = 42)	χ2	P value
Sex
Male	18	17
Female	22	25	0.171	0.679
Age
≤ 65 years old	12	16
> 65 years old	28	26	0.597	0.440
Stone diameter
≤ 10 mm	19	24
> 10 mm	21	18	0.764	0.382
Number of stones
Single	30	28
Multiple	10	14	0.687	0.407
Disease course
≤ 2 years	25	21
> 2 years	15	21	1.300	0.254
Sphincter of Oddi function
Normal	28	32
Abnormal	12	10	0.400	0.527