Table 1. Characteristics of the study sample. * standard deviation.

		The whole group (n=429)
Age (years, mean ± SD*)		46.4 ± 12.7
Females		312 (72.7%)
Males		117 (27.3%)
Education	Elementary school	50 (11.7%)
	High school	265 (61.8%)
	Higher education	114 (26.5%)
Primary reason for visiting a general practitioner	Cardiovascular disorder	78 (18.2%)
	Respiratory disorder	9 (2.1%)
	Psychiatric disorder	11 (2.6%)
	Neurological disorder	226 (52.7%)
	Gastrointestinal disorder	10 (2.3%)
	Musculoskeletal disorder	26 (6.1%)
	Endocrinological disorder	17 (4.0%)
	Infection	37 (8.6%)
	Other	15 (3.5%)
Previous diagnosis of migraine without aura	Yes	117 (27.3%)
	No	312 (72.7%)
Family diagnosis of migraine	Yes	142 (33.1%)
	No	287 (66.9%)
Smoking	Yes	151 (35.2%)
	No	278 (64.8%)
Drinking coffee	Yes	370 (86.2%)
	No	59 (13.8%)
Diagnosis of migraine without aura according to International Headache Society (IHS) criteria	Yes	265 (61.8%)
	No	164 (38.2%)