Univariate analysis of predictors of overall survival
| Variable | HR | χ2 | 95% CI | P value |
| Age | 1.01 | 0.989 to 1.035 | 0.314 | |
| Sex | 0.34 | 0.559 | ||
| Performance status | 1.66 | 0.437 | ||
| Smoking | 6.55 | 0.0105 | ||
| Invasion: | ||||
| Lymphovascular | 17.3 | <0.0001 | ||
| Visceral pleural | 4.04 | 0.0444 | ||
| Parietal pleural | 26.31 | <0.0001 | ||
| Mediastinal | 0.01 | 0.9169 | ||
| Chest wall | 26.82 | <0.0001 | ||
| Intra-alveolar spread (stas) | 1.27 | 0.2599 | ||
| Adenocarcinoma subtype | ||||
| Lepidic | Base | Base | Base | |
| Acinar | 1.165 | 0.679 to 1.997 | 0.579 | |
| Papillary | 0.684 | 0.275 to 1.704 | 0.415 | |
| Micropapillary | 1.497 | 0.811 to 2.763 | 0.197 | |
| Solid | 2.228 | 1.229 to 4.038 | 0.008 | |
| Stage | ||||
| Ia | Base | Base | Base | |
| Ib | 1.438 | 0.760 to 2.722 | 0.264 | |
| IIa | 3.298 | 1.741 to 6.247 | 0.000 | |
| IIb | 5.062 | 2.491 to 10.29 | 0.000 | |
| IIIa | 3.328 | 1.829 to 6.054 | 0.000 | |
| Operation type | ||||
| Lobectomy | Base | Base | Base | |
| Segmentectomy | 0.923 | 0.339 to 2.513 | 0.875 | |
| Pneumonectomy | 2.213 | 1.024 to 4.782 | 0.043 | |
| Bilobectomy | 2.333 | 1.131 to 4.813 | 0.022 | |