Table 3.

Multivariate analysis of predisposing and protective factors for headache-related findings in emergency MRI

	OR	95% CI (lower–upper)	P-value
Age over 40 years*	2.6	1.7–3.8	< 0.001
Smoking	2.4	1.1–4.9	0.026
Signs/symptoms of infection	2.3	1.1–4.7	0.025
Nausea	1.9	1.2–2.9	0.004
Numbness	0.6	0.38–0.97	0.034
Migraine in history	0.5	0.26–0.90	0.015

OR, odds ratio; CI, confidence interval

^*Age cut-off point determined by Kolmogorov–Smirnov metric