Table 3.
Factors associated with OS according to multivariate Cox analysis
| Factors | Groups | HR (95% CI) | p |
|---|---|---|---|
| Age | ≤ 65 | 1.000 | |
| > 65 | 1.339 (1.011–1.772) | 0.042 | |
| Site of lesion | Upper | 2.237 (1.353–3.699) | 0.002 |
| Middle | 1.380 (0.929–2.052) | 0.111 | |
| Lower | 1.000 | ||
| SLNs in CT | No | 1.000 | |
| Yes | 1.554 (1.152–2.095) | 0.004 | |
| Dissected LN | < 12 | 1.502 (1.105–2.041) | 0.009 |
| ≥ 12 | 1.000 | ||
| pT | pT1 | 1.000 | |
| pT2 | 2.712 (1.624–4.529) | < 0.001 | |
| pT3 | 3.710 (2.309–5.962) | < 0.001 |
Abbreviations and definitions: OS overall survival, HR hazard ratio, CI confidence interval, dissected LNs the number of dissected lymph nodes at the time of surgery, SLNs in CT small lymph nodes in mediastinum (diameter < 1 cm) in CT image prior to surgery