Table 4. ERCP assignments overview in procedural time.

		Novice n = 11	Intermediate n = 5	Experienced n = 8	Expert n = 22	P value 1
Positioning endoscope	Mean	01:07	00:26	00:11	00:14	0.000
	Median	00:59	00:15	00:10	00:12
	Range	00:25 – 02:31	00:09 – 01:08	00:08 – 00:20	00:06 – 00:40
CBD cannulation	Mean	02:03	01:36	00:48	00:39	0.000
	Median	02:05	00:52	00:45	00:40
	Range	00:37 – 04:05	00:28 – 03:24	00:11 – 01:14	00:05 – 01:31
PD cannulation	Mean	05:47	01:55	01:09	01:06	0.013
	Median	06:27	01:17	01:13	00:27
	Range	00:12 – 10:00	00:13 – 06:18	00:05 – 03:58	00:06 – 05:17
PD stent placement	Mean	03:35	00:43	00:45	00:39	0.000
	Median	06:53	00:47	00:48	00:38
	Range	01:15 – 10:00	00:30 – 00:49	00:26 – 01:12	00:13 – 01:27
CBD stone extraction	Mean	05:11	03:05	02:31	01:25	0.044
	Median	03:55	01:46	02:41	01:06
	Range	01:38 – 10:00	00:47 – 10:00	00:32 – 04:24	00:37 – 03:32
CBD stent placement	Mean	04:21	03:11	01:15	01:25	0.000
	Median	03:42	01:56	01:08	01:06
	Range	01:14 – 10:00	01:03 – 08:38	00:51 – 01:48	00:37 – 03:32
Total procedure time	Mean	21:09	10:58	06:42	06:05	0.000
	Median	20:21	10:20	06:33	05:39
	Range	07:16 – 34:07	04:20 – 28:49	04:32 – 09:10	02:32 – 12:02

Procedural time in mm:ss

CBD, common bile duct; PD, pancreatic duct

¹Kruskal-Wallis Test