Table 2 Physical exam and history predictors of SAH
| Finding | Positive LR | Negative LR |
|---|---|---|
| Exam neck stiffness | 6.59 | 0.78 |
| Subjective neck stiffness | 4.12 | 0.73 |
| Lethargy | 2.19 | 0.74 |
| Vomiting | 1.92 | 0.52 |
| Similar headache in past | 1.90 | 0.90 |
| Onset of headache 1–5 min | 1.79 | 0.88 |
| “Worst headache of life” | 1.25 | 0.24 |
| Nausea | 1.15 | 0.74 |
| Onset of headache < 1 h | 1.13 | 0.06 |
| Photophobia | 1.07 | 1.05 |
| Diplopia | 0.96 | 1.00 |
| Onset of headache < 1 min | 0.91 | 1.11 |
| Family history of cerebral aneurysm | 0.22 | 1.07 |
| Absence of “worst headache of life” | -- | 0.36 |