| Risk Factors | Odds Ratio (C.I Lower - Upper) | P-Value |
| Fever | 0.462 (0.114 - 1.876) | 0.280 |
| Altered Level of Consciousness | 0.955 (0.252 - 3.622) | 0.945 |
| Fits | 1.473 (0.409 - 5.300) | 0.553 |
| Neck Rigidity | 0.844 (0.240 - 2.969) | 0.791 |
| Headache | 1.326 (0.387 - 4.544) | 0.654 |
| Vomiting | 0.273 (0.032 - 2.339) | 0.236 |
| Dizziness | 8.364 (0.694 - 100.771) | 0.094 |