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| Variable | Low (<10/year) | Medium (10–20/year) | High (>20/year) | P |
|---|---|---|---|---|
| 30-day mortality | 48 (5.1) | 8 (2.3) | 7 (2.1) | 0.01 |
| 90-day mortality | 85 (9.1) | 15 (4.2) | 16 (4.8) | 0.002 |
| pT2N0 | 366 (33.9) | 124 (30.9) | 75 (20.9) | <0.001 |
| pT0–2N0 | 606 (56.1) | 246 (61.3) | 182 (50.8) | 0.01 |
