Table III.

Results of univariate analysis on DC

Group	NLC group (n = 148)	DC group (n = 53)	χ2
BMI > 25 kg/m2	52 (35.1)	35 (66.1)	15.181**
WBC > 10.0 × 109/l	3 (2.0)	6 (11.3)	5.858*
History of gallbladder puncture	6 (4.1)	10 (18.9)	9.755**
History of ERCP	7 (4.7)	7 (13.2)	3.119
History of pancreatitis	8 (5.4)	8 (15.1)	3.765
Calculus incarcerated in neck of gallbladder	5 (3.5)	7 (13.2)	5.079*
Acute cholecystitis in the last 2 months > 4 times	13 (8.8)	29 (54.7)	49.813**
Thickness of gallbladder wall	3 (2.0)	10 (18.9)	15.618**
The maximum stone diameter > 2 cm	17 (11.5)	19 (35.8)	15.754**

^*P < 0.05,

^**P < 0.01, ERCP – endoscopic retrograde cholangiopancreatography.