Table 5: Features of the brain metastasis affecting survival in univariate and multivariate analysis (Cox regression model).
CI*: confidence interval, NA†: not assessed, MCR‡: microscopic complete resection, GTR§: gross total resection.
| Factor | median survival (month) | univariate analysis (month) | Hazard ratio (95% CI*) | multivariate analysis (month) | Hazard ratio (95% CI) |
| Timing of metastasis | synchronous | 13.5 | 0.398 | 1.24 (0.76, 2.02) | NA† | |
| metachronous | 11.7 |
| Tumor size | < 3cm | 13.9 | 0.968 | 1.01 (0.62, 1.64) | NA | |
| ≥ 3cm | 12.1 |
| Tumor locations | supratentorial | 13.1 | 0.465 | 1.26 (0.68, 2.35) | NA | |
| infratentorial | 10.3 |
| Method of surgery | Group A (MCR‡) | 13.1 | 0.309 | 1.27 (0.80, 2.04) | 0.776 | 1.09 (0.59, 2.01) |
| Group B (GTR§) | 12.1 |