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|
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
|
