Table 6.
—Univariate Cox and Extended Cox Models for Time to Tumor Overgrowth
| Characteristic | Hazard Ratio | 95% CI | P Value |
| Sex: male vs female | 0.49 | 0.18-1.37 | .175 |
| Active/ex-smoker vs never smoked | 1.12 | 0.376-3.36 | .835 |
| Preprocedure chemotherapy: yes vs no | 1.89 | 0.53-6.72 | .326 |
| Postprocedure chemotherapy: yes vs no (time varying) | 1.16 | 0.37-3.66 | .806 |
| Preprocedure radiation: yes vs no | 1.70 | 0.61-4.73 | .307 |
| Postprocedure radiation: yes vs no (time varying) | 1.29 | 0.44-3.73 | .642 |
| Lung cancer vs other type of cancer | 0.39 | 0.11-1.40 | .150 |
| Obstruction ≥ 50% preprocedure | 13.71 | 1.75-107.55 | .013 |
| Stent present (time varying) | 1.40 | 0.38-5.19 | .619 |