Table 1.

Clinical and demographic data from patients with chronic migraine (CM) and healthy controls (HC)

	Healthy Controls (HC; n = 20)	Chronic Migraine (CM; n = 20)
Sex (female/male)	13 (65%) / 7 (35%)	14 (70%) / 6 (30%)
Age (years)	28.75 ± 3.89	31.95 ± 9.88
Days with headache/month (number)		23.0 ± 6.8
Disease duration (year)		15.0 ± 13.1
Severity of headache (0–10)		7.6 ± 1.6
Duration of the chronic headache phase (months)		17.1 ± 29.3
Tablet intake/month (number)		3.0 ± 3.2

Gender is expressed as frequency (percentage), other data are expressed as mean ± SD