Table 1.

Comparisons of baseline data of patients between two groups.

Factors	Control group n=72	Observation group n=67	P
Sex (Male/Female)	35/37	31/36	0.915
Age (years)	25~70	25~75
Average age (years)	56.53±8.48	56.82±8.57	0.842
BMI (kg/m2)	24.23±1.15	24.56±1.17	0.096
Type of disease (n, %)
Choledocholithiasis	36 (50.00)	32 (47.76)	0.793
Pancreatolithiasis	21 (29.17)	18 (26.87)
Stricture of bile duct	10 (13.89)	9 (13.43)
Pancreatic tumor	5 (6.94)	8 (11.94)