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| Items | C-statistic | 95% confidence interval | P-value |
|---|---|---|---|
| 5-year OS in the training set | 0.723 | 0.676 to 0.771 | <0.05 |
| 5-year LMFS in the training set | 0.661 | 0.612 to 0.710 | <0.05 |
| 5-year OS in the validation set | 0.710 | 0.611 to 0.809 | <0.05 |
| 5-year LMFS in the validation set | 0.693 | 0.592 to 0.795 | <0.05 |
OS: overall survival; LMFS: lung metastasis-free survival.
