TABLE 2b.

The stent patency periods and 1‐year stent dysfunction rates for the first endoscopic retrograde cholangiography.

	Total	IS	PS
	n = 48	n = 18	n = 30	p‐value
Median period of stent patency, days	196	369	154	0.01
Stent dysfunction factor
Cases of stent occlusion within a year, n (%)		8 (44%)	14 (47%)
One‐year stent occlusion rate, %		48%	65%	0.28
Cases of acute cholangitis within a year, n (%)		2 (11%)	9 (30%)
One‐year acute cholangitis rate, %		20%	43%	0.04
Cases of stent dislocation within a year, n (%)		0 (0%)	10 (33%)
One‐year stent dislocation rate, %		0%	43%	0.004

Abbreviations: IS, inside stent; PS, plastic stent.

The median periods of stent patency and 1‐year stent dysfunction rates were analyzed using the Kaplan‐Meier method (the log‐rank test).