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| Variables | Parameter estimated | Standard error | Chi square | P value | Hazard ratio | 95% CI |
|---|---|---|---|---|---|---|
| Thoracotomy vs. VATS | 0.67 | 0.34 | 3.77 | 0.05 | 1.96 | (0.99, 3.89) |
| Angiolymphatic invasion | 0.11 | 0.32 | 0.12 | 0.71 | 1.12 | (0.59, 2.12) |
| Down staging | −0.47 | 0.33 | 2.03 | 0.16 | 0.62 | (0.32, 1.19) |
| Perineural invasion | 1.83 | 0.76 | 5.93 | 0.01 | 6.29 | (1.32, 27.67) |
VATS, video-assisted thoracoscopic surgery; CI, confidence interval.
