Table 3 Multivariable* risk factors for headache chronicity in patients with episodic migraine

Risk factorsOdds ratio95% CIp Value
* Adjusted for all other variables in the model.
Headache frequency 5–9 d6.21.7–26.60.005
Headache frequency >10 d20.15.7–71.50.001
Overuse19.48.7–43.20.001