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Lymph node ratio
| Level | IIb sparing | Control group | ||||
|---|---|---|---|---|---|---|
| Harvested | Positive | Ratio (%) | Harvested | Positive | Ratio (%) | |
| Level Ia | 36 | 0 | 0 | 62 | 0 | 0 |
| Level Ib | 66 | 1 | 1.5 | 95 | 3 | 3.1 |
| Level IIa | 92 | 1 | 1 | 142 | 0 | 0 |
| Level IIb | – | – | – | 123 | 0 | 0 |
| Level III | 52 | 0 | 0 | 115 | 0 | 0 |
| Total | 259 | 2* | 0.77 | 561 | 3* | 0.53 |
*All patients were clinically N0, and only 3 patients had 5 positive nodes
