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| Variable | RR | 95% CI | P |
| PFC | 1.5 | 1.1-2.1 | 0.008 |
| PC | 1.4 | 1.0-2.0 | 0.042 |
| Smoking status | 1.5 | 1.1-2.0 | 0.007 |
| Size of BM | 1.6 | 1.1-2.3 | 0.027 |
| N category | 1.8 | 1.3-2.5 | 0.001 |
| Treatment modality | 0.5 | 0.3-0.7 | <0.001 |
PFC, plasma fibrinogen concentration; PC, platelet count; RR, relative risk; CI, confidence interval; BM, brain metastasis.
