Table 2 Physical exam and history predictors of SAH

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”

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0.36