2.
影响Ib期上叶肺癌生存率的预后因素（Cox回归分析）
Prognostic factors for patients with stage Ib upper lobe NSCLC (Cox regression model)
| Factors | P | Hazard ratio (HR) | 95%CI | |
| Lower | Upper | |||
| Age | 0.001 | 1.075 | 1.031 | 1.120 |
| Gender | 0.508 | 0.772 | 0.359 | 1.660 |
| Tumor location | 0.434 | 1.283 | 0.687 | 2.396 |
| Grade of differentiation | 0.058 | 0.795 | 0.628 | 1.008 |
| Visceral pleura invasion | 0.074 | 0.412 | 0.156 | 1.091 |
| Histological type | 0.927 | 0.975 | 0.568 | 1.673 |
| Tumor size | 0.000, 9 | 1.468 | 1.212 | 1.777 |
| Number of removed LN | 0.665 | 0.666 | 0.105 | 4.204 |
| Number of removed MLN | 0.424 | 1.871 | 0.403 | 8.694 |
| Number of removed SMLNS | 0.003 | 0.446 | 0.263 | 0.757 |