Effect of the extrahepatic bile duct anatomy on choledocholithiasis and its clinical significance

Table 2 Univariate analysis for anatomical factors of the extrahepatic bile duct

Variable	Without CBD stones (n = 124)	With CBD stones (n = 108)	P value
CHD diameter (mm)	4.10 (3.20, 6.03)	9.40 (6.88, 12.50)	< 0.001
CD diameter (mm)	3.10 (2.40, 4.93)	5.85 (3.70, 8.50)	< 0.001
CBD diameter (mm)	5.00 (3.80, 6.70)	10.35 (8.10, 13.00)	< 0.001
CHD length (mm)	20.51 ± 8.88	25.12 ± 12.58	0.002
CD length (mm)	26.10 ± 12.76	35.83 ± 21.69	< 0.001
CBD length (mm)	50.46 ± 12.87	52.65 ± 13.84	0.212
CBD angulation (°)	138.94 ± 19.19	112.79 ± 19.12	< 0.001
Oblique angle of the CBD (°)	60.12 ± 18.54	47.08 ± 19.85	< 0.001
Insertion position of CD, n (%)
Anterior	15 (12.10)	21 (19.44)	0.123
Posterior	8 (6.45)	33 (30.56)	< 0.001
Lateral	95 (76.61)	50 (46.30)	< 0.001
Medial	6 (4.84)	4 (3.70)	0.920
Upper	85 (68.55)	57 (52.78)	0.014
Middle	38 (30.65)	48 (44.44)	0.030
Lower	1 (0.81)	3 (2.78)	0.519
Route of CD, n (%)
Linear type	15 (12.10)	8 (7.41)	0.233
Curved type	92 (74.19)	80 (74.07)	0.983
Spiral type	8 (6.45)	14 (12.96)	0.091
Complex type	9 (7.26)	6 (5.56)	0.599
Route of CBD, n (%)
Polyline type	118 (95.16)	98 (90.74)	0.185
S type	6 (4.84)	10 (9.26)	0.185

CHD: Common hepatic duct; CD: Cystic duct; CBD: Common bile duct.