Incidence and predictors for chronicity of headache in patients with episodic migraine.
The authors followed 532 consecutive patients with episodic migraine (<15 days/month) for 1 year. Sixty-four patients (14%) developed chronic headache (>/=15 days/month). The odds ratios for developing CH were 20.1 (95% CI 5.7 to 71.5) comparing patients with a "critical" (10 to 14 days/month) vs "low" (0 to 4 days/month) and 6.2 (95% CI 1.7 to 26.6) in patients with an "intermediate" (6 to 9 days/month) vs "low" headache frequency and 19.4 (95% CI 8.7 to 43.2) comparing patients with and without medication overuse.
Katsarava
Z
Z
Department of Neurology, University Hospital Essen, Germany.
Schneeweiss
S
S
Kurth
T
T
Kroener
U
U
Fritsche
G
G
Eikermann
A
A
Diener
H-C
HC
Limmroth
V
V
D000328:Adult; D002908:Chronic Disease; D005260:Female; D020773:Headache Disorders / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D008881:Migraine Disorders / Q000453:epidemiology*; D012307:Risk Factors