Table 3
Multivariable
^{*}
risk factors for headache chronicity in patients with episodic migraine
Risk factors
Odds ratio
95% CI
p
Value
* Adjusted for all other variables in the model.
Headache frequency 5–9 d
6.2
1.7–26.6
0.005
Headache frequency >10 d
20.1
5.7–71.5
0.001
Overuse
19.4
8.7–43.2
0.001