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Table 2 Physical exam and history predictors of SAH

From: Subarachnoid hemorrhage in the emergency department

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
  1. LR Likelihood ratio