Effect of brush rinse on the diagnostic accuracy of biliary stricture evaluation: A multicenter trial

Table 3 Median number of cell cluster according to bile duct location

Proximal bile duct	Brush-wash (n = 38)	Sheath-rinse (n = 38)	P value1
Total cell clusters	3 (1-7)	14 (8-23)	< 0.001
Large (> 50 cells) clusters	5 (1-19)	12 (4-77)	< 0.009
Medium (6-49 cells) clusters	5 (1-13)	8 (3-53)	< 0.019
Small (2-5 cells) clusters	5 (1-19)	13 (3-54)	< 0.017
Single-cell clusters	18 (1-70)	54 (9-207)	< 0.0021
Distal bile duct	Brush-wash (n = 74)	Sheath-rinse (n = 74)	P value1
Total cell clusters	3 (2-6)	10 (3-19)	< 0.001
Large (> 50 cells) clusters	2 (1-11)	7 (2-28)	< 0.001
Medium (6-49 cells) clusters	2 (1-6)	7 (3-18)	< 0.001
Small (2-5 cells) clusters	3 (1-9)	8 (2-22)	< 0.001
Single-cell clusters	4 (0-28)	18 (3-82)	< 0.001

¹Wilcoxon rank sum test.

Values are expressed as median (interquartile range).