| ESD-P | ESD-N | p | ASD |
---|---|---|---|---|
n = 41 | n = 1005 | |||
Age | Â | Â | 0.83 | Â |
 Mean ± SD | 70.4 ± 9.16 | 71.0 ± 8.82 |  |  |
 Median (range) | 70 (65–78) | 72 (65–77) |  | 0.834 |
Sex | Â | Â | 0.004* | Â |
 Male | 37 (90.2%) | 706 (70.2%) |  | 0.14 |
 Female | 4 (9.8%) | 299 (29.8%) |  | 0.14 |
Lesion location |  |  | < 0.001* |  |
 U | 13 (31.7%) | 157 (15.6%) |  | 0.39 |
 M | 24 (58.5%) | 501 (34.5%) |  | 0.50 |
 L | 4 (9.8%) | 347 (49.9%) |  | 0.97 |
Morphology | Â | Â | 0.62 | Â |
 Protruding | 16 (39.1%) | 322 (32.0%) |  | 0.15 |
 Flat | 0 (0%) | 11 (1.1%) |  | 0.15 |
 Depressed | 25 (61.0%) | 672 (66.9%) |  | 0.12 |
Histology | Â | Â | 0.27 | Â |
Differentiated | 39 (95.1%) | 981 (97.6%) | Â | 0.13 |
Undifferentiated | 2 (4.9%) | 24 (2.4%) | Â | 0.13 |
Lesion size (mm) | Â | Â | 0.06 | Â |
 Mean ± SD | 15.0 ± 7.16 | 19.8 ± 13.8 |  | 0.44 |
 Median (range) | 14 (4–35) | 16 (2–115) |  |  |
Specimen size (mm) | Â | Â | 0.56 | Â |
 Mean ± SD | 38.7 ± 8.18 | 42.4 ± 15.3 |  | 0.30 |
 Median (range) | 40 (16–60) | 40 (15–140) |  |  |
Depth | Â | Â | 0.50 | Â |
 pT1a | 37 (90.2%) | 858 (85.4%) |  | 0.15 |
 pT1b | 4 (9.8%) | 147 (14.6%) |  | 0.15 |
Ulcer (scar) | Â | Â | 0.76 | Â |
 Presence | 2 (4.9%) | 80 (8.0%) |  | 0.12 |
 Absence | 39 (95.1%) | 921 (92.0%) |  | 0.12 |
Suture line or anastomotic site |  |  | – |  |
 Involving | 19 (%) | – |  | – |
 Not involving | 22 (%) | – |  | – |
Skill level |  |  | < 0.001* |  |
 Expert | 36 (87.8%) | 623 (62.0%) |  | 0.62 |
 Trainee | 5 (12.2%) | 382 (38.0%) |  | 0.62 |