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Multivariate analysis of factors contributing to survival
| Variables | HR | 95%CI | P value |
| Tumor stage | |||
| I | 1 | ||
| II | 1.189 | 0.406-3.481 | 0.752 |
| III | 3.763 | 0.896-15.796 | 0.070 |
| B-mode classification | |||
| Type 2b | 1 | ||
| Type 1 | 7.146 | 1.924-26.538 | 0.003 |
| Type 2c | 3.055 | 0.668-13.970 | 0.150 |
HR: Hazard ratio.
