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Comparison of baseline data between training and testing cohort.
| Variables | Training cohort | Testing cohort | p value |
|---|---|---|---|
| Age | 60.87 ± 6.59 | 60.98 ± 6.86 | 0.869 |
| T stage | — | — | 0.349 |
| T2a | 1 (0.5%) | 5 (2.5%) | — |
| T2b | 4 (2.0%) | 5 (2.5%) | — |
| T2c | 62 (30.4%) | 73 (36.3%) | — |
| T3a | 69 (33.7%) | 62 (30.8%) | — |
| T3b | 62 (30.4%) | 52 (25.9%) | — |
| T4 | 2 (1.0%) | 3 (1.5%) | — |
| Unknown | 4 (2.0%) | 1 (0.5%) | — |
| N stage | — | — | 0.252 |
| N0 | 148 (72.6%) | 142 (70.7%) | — |
| N1 | 34 (16.7%) | 27 (13.4%) | — |
| Unknown | 32 (15.7%) | 32 (15.9%) | — |
