Table 3 Characteristics of NCR cases in both training and validation sets.
Variables | NCR of training set (n = 70) n(%) | NCR of validation set (n = 21) n(%) | p value |
|---|---|---|---|
Tumor size (mm) | |||
≤ 20 | 42 (60.0%) | 5 (23.8%) | < 0.05 |
20–30 | 14 (20.0%) | 7 (33.3%) | |
> 30 | 14 (20.0%) | 9 (42.9%) | |
Depth of invasion | |||
T1a (Mucosa) | 24 (34.3%) | 11 (52.4%) | > 0.05 |
T1b1 (SM1, < 500 μm) | 20 (28.6%) | 3 (14.3%) | |
T1b2 (SM2, ≥ 500 μm) | 26 (37.1%) | 7 (33.3%) | |
Histology | |||
Differentiated | 25 (35.7%) | 3 (14.3%) | < 0.05 |
Undifferentiated | 45 (64.3%) | 18 (85.7%) | |
Positive lymphovascular invasion (LVI+) | 6 (8.6%) | 1 (4.8%) | > 0.05 |
Positive vertical margin (VM1) | 21 (30.0%) | 5 (23.8%) | > 0.05 |
Ulceration | 22 (31.4%) | 6 (28.6%) | > 0.05 |
