Table 3.

Results of logistic regression.

	OR	95% CI	p value
Age	1.033	0.975–1.096	0.269
Sex	0.661	0.180–2.419	0.531
Presence of systemic disease	0.671	0.196–2.296	0.525
Headache duration	1.143	1.050–1.243	0.002*
Headache frequency	1.014	0.946–1.086	0.703
VAS	0.836	0.641–1.091	0.188

OR, odds ratio; CI, confidence interval; VAS, visual analogue scale; *p value < 0.01.