Table 2.

Detectability of common bile duct stones according to stone size and stone type n (%)

	n	Detectable (n = 111)	Undetectable (n = 19)	P value
Size (mm)
< 3	9	4 (44)	5 (56)	< 0.001
3–5	40	29 (74)	11 (26)
6–10	45	43 (96)	2 (4)
11–15	26	25 (96)	1 (4)
> 15	10	10 (100)	0 (0)
≤ 5	49	33 (67)	16 (33)	< 0.001
> 5	81	78 (96)	3 (4)
Type
Black pigment	23	21 (91)	2 (9)	< 0.001
Mixed cholesterol	38	36 (95)	2 (5)
Brown pigment	60	54 (90)	6 (10)
Pure cholesterol	9	0 (0)	9 (100)
Black or mixed	61	57 (93)	4 (7)	0.023
Brown or pure cholesterol	69	54 (78)	15 (22)