Table 2.
Matching factors between two groups after propensity score matching
| ESD-C n = 44 | ESD-O n = 44 | P value | ASD | |
| Variable matching between groups | ||||
| Age, yr; mean ± SD | 73.16 ± 8.59 | 71.11 ± 8.81 | 0.2732 | 0.2360 |
| Sex: Male/female | 8/36 | 6/38 | 0.7721 | 0.1250 |
| Underlying disease: No/yes | 28/16 | 29/15 | 11 | 0.0476 |
| Anti-thrombotic drugs: No/yes | 2/42 | 3/41 | 11 | 0.0983 |
| Tumor location: Upper third/others | 7/37 | 2/42 | 0.2501 | 0.3810 |
| Tumor position: Lessor/others | 19/25 | 21/23 | 0.8311 | 0.0914 |
| Morphology: Flat or depressed/others | 25/19 | 28/16 | 0.6631 | 0.1400 |
| Histology: Undifferentiated/others | 0/44 | 0/44 | - | 0 |
| Tumor size, mm: mean ± SD | 16.89 ± 12.65 | 20.90 ± 13.30 | 0.0762 | 0.3090 |
| Tumor depth: Mucosa/submucosa | Jun-38 | Jun-38 | 11 | 0 |
| Ulceration, positive | 6 (13.6%) | 4 (9.1%) | 0.7391 | 0.1440 |
| Operator skill: Expert/trainee | 14/30 | 14/30 | 11 | 0 |
1
P value was calculated using Fisher’s exact test;
2
P value was calculated using a t test for continuous data. ESD-C: Endoscopic submucosal dissection with Clutch Cutter; ESD-O: Endoscopic submucosal dissection with another end-knife; SD: Standard deviation; ASD: Absolute standardized difference.