Table 2. ESD procedural experience of each endoscopist in this study period.
| Endoscopist | Colorectal ESD cases performed before this study | Pocket-creation method for large sessile tumors/total pocket-creation method | Conventional method for large sessile tumors/total conventional method |
| A 1 | 36 | 7/83 | 5/37 |
| B 1 | 172 | 7/35 | 4/39 |
| C 1 | 134 | 5/62 | 12/56 |
| D | 4 | 5/30 | 0/0 |
| E 1 | 203 | 4/15 | 9/68 |
| F | 0 | 2/22 | 2/42 |
| G | 0 | 2/24 | 0/0 |
| H | 0 | 2/37 | 0/0 |
| I | 0 | 1/19 | 6/41 |
| J | 0 | 1/17 | 5/26 |
| K | 2 | 1/57 | 1/8 |
| L | 0 | 1/7 | 0/3 |
| M | 0 | 1/1 | 0/0 |
| N | 0 | 1/6 | 0/1 |
| O | 0 | 0/0 | 3/8 |
| P | 0 | 0/0 | 2/15 |
| Q | 0 | 0/0 | 1/3 |
| Others | 0 | 0/75 | 0/50 |
ESD, endoscopic submucosal dissection
1
Expert endoscopist.