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| Differentiated type carcinoma | Undifferentiated type carcinoma | P value | |
| NBI microvascular density, % | 10.02 ± 4.72 | 4.02 ± 0.40 | < 0.001 |
| Histological vascular density, % | |||
| Whole mucosal layer | 5.81 ± 3.17 | 3.25 ± 1.21 | 0.016 |
| Surficial mucosal layer (0 – 100 μm) | 6.38 ± 3.73 | 3.66 ± 1.46 | 0.029 |
