Table 3

Clinical features predicting secondary headache (prior odds of secondary headache = 18.8%)

Clinical featureWeight of evidencePosterior odds (%)
Plantars up-going1755.0
Plantars equivocal1252.6
Age>65 years1447.5
Abnormal respiratory examination1345.0
Pain stabbing in character1037.8
Neck stiffness833.2
Pulse>90 bpm833.2
Systolic BP>160 mm Hg731.0
Diastolic BP>100 mm Hg731.0
Abnormal cranial nerve examination731.0
Pain in the orbit628.9
Abnormal auroscopy628.9
Abnormal CVS examination526.9
Abnormal limb power526.9