Multivariable Cox regression analysis on the association between predictor variables and decreased survival.
| Variable | Hazard Ratio | 95% CI | P Value | Regression Coefficient | Risk Scorea |
| Karnofsky performance status (<70) | 1.53 | 1.03–2.28 | 0.035 | 0.43 | 1 |
| Presence of multiple spinal metastasis | 2.02 | 1.35–3.03 | <0.001 | 0.70 | 1 |
| Presence of visceral metastasis | 1.77 | 1.16–2.70 | 0.008 | 0.57 | 1 |
| Primary tumor growth (Tomita Scale) | <0.001 | ||||
| Slow | Reference | 0 | |||
| Moderate | 2.31 | 1.30–4.09 | 0.004 | 0.84 | 1 |
| Fast | 4.16 | 2.57–6.73 | <0.001 | 1.43 | 2 |
↵a Risk scores are based on rounding the regression coefficient up to the nearest integer.