A headache duration ≥1 year and the presence of another primary headache disorder were marginally associated with neuroimaging abnormalities (OR=1.34, 95% CI=0.95–1.89; and OR=1.51, 95% CI=0.92–2.46; respectively); these associations did not reach statistical significance.
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Factors Associated with Incidental Neuroimaging Abnormalities in New Primary Headache Patients.
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