| Total n = 149 | ESD-M n = 73 | ESD-F n = 76 | p value | ASD |
---|---|---|---|---|---|
Age (years) | Â | Â | Â | Â | Â |
 Mean ± SD | 73.3 ± 8.6 | 73.0 ± 8.4 | 73.6 ± 8.7 | 0.67¶ | 0.0702 |
 Median (range) | 74 (52–91) | 74 (52–91) | 74 (52–90) | 0.67§ |  |
Gender |  |  |  | 0.4‡ |  |
 Male | 97 (65.1%) | 45 (61.6%) | 52 (68.4%) |  | 0.143 |
 Female | 52 (34.9%) | 28 (38.4%) | 24 (31.6%) |  | 0.143 |
Underlying disease |  |  |  | 0.49‡ |  |
 None | 132 (88.6%) | 66 (90.4%) | 66 (86.8%) |  | 0.113 |
Cardiomyopathy or cirrhosis | 17 (11.4%) | 7 (9.6%) | 10 (13.2%) | Â | 0.143 |
Antithrombotic drugs |  |  |  | 0.091‡ |  |
 None or discontinuation | 143 (96.0%) | 72 (98.6%) | 71 (93.4%) |  | 0.268 |
 Continuation | 6 (4.0%) | 1 (1.4%) | 5 (6.6%) |  | 0.268 |
Location of lesions |  |  |  | 0.055†|  |
 Upper | 24 (16.1%) | 12 (16.4%) | 12 (15.8%) |  | 0.0163 |
 Middle | 54 (36.2%) | 33 (45.2%) | 21 (27.6%) |  | 0.372 |
 Lower | 71 (47.7%) | 28 (38.4%) | 43 (56.6%) |  | 0.371 |
Position of lesions |  |  |  | 0.44†|  |
 Lesser curvature | 60 (40.2%) | 30 (41.1%) | 30 (39.5%) |  | 0.0326 |
 Greater curvature | 38 (25.5%) | 22 (30.1%) | 16 (21.1%) |  | 0.207 |
 Anterior wall | 29 (19.5%) | 11 (15.1%) | 18 (23.7%) |  | 0.219 |
 Posterior wall | 22 (14.8%) | 10 (13.7%) | 12 (15.8%) |  | 0.0592 |
Morphology |  |  |  | 0.27†|  |
 Protruding | 55 (36.9%) | 30 (41.1%) | 25 (32.9%) |  | 0.170 |
 Flat | 1 (0.7%) | 1 (1.4%) | 0 (0%) |  | 0.169 |
 Depressed | 93 (63.4%) | 42 (57.5%) | 51 (67.1%) |  | 0.199 |
Histology |  |  |  | 0.68‡ |  |
 Differentiated | 144 (96.6%) | 70 (95.9%) | 74 (97.4%) |  | 0.0834 |
 Undifferentiated | 5 (3.4%) | 3 (4.1%) | 2 (2.6%) |  | 0.0834 |
Lesion size (mm) | Â | Â | Â | Â | Â |
 Mean ± SD | 16.6 ± 10.0 | 17.2 ± 9.3 | 16.1 ± 10.6 | 0.49¶ | 0.110 |
 Median (range) | 15 (3–77) | 15 (3–40) | 14 (4–77) | 0.27§ |  |
Specimen size (mm) | Â | Â | Â | Â | Â |
 Mean ± SD | 39.0 ± 12.0 | 39.8 ± 11.6 | 38.2 ± 12.4 | 0.42¶ | 0.133 |
 Median (range) | 36 (17–110) | 40 (17–75) | 35 (20–110) | 0.35§ |  |
Depth |  |  |  | 0.68†|  |
 pT1a | 132 (88.6%) | 63 (86.3%) | 69 (90.8%) |  | 0.0724 |
 pT1b1 | 7 (4.7%) | 4 (5.5%) | 3 (3.9%) |  | 0.0757 |
 pT1b2 | 10 (6.7%) | 6 (8.2%) | 4 (5.3%) |  | 0.116 |
Presence of ulceration | 17 (11.4%) | 10 (13.7%) | 7 (9.2%) | 0.45‡ | 0.142 |
Operator level |  |  |  | < 0.001‡ |  |
 Experts | 70 (47.0%) | 47 (64.4%) | 23 (30.3%) |  | 0.727 |
Electrosurgical unit |  |  |  | 0.009‡ |  |
 VIO 300D | 128 (85.9%) | 57 (78.1%) | 71 (93.4%) |  | 0.450 |
 ICC200 | 21 (14.1%) | 16 (21.9%) | 5 (6.6%) |  | 0.450 |