Fig. 1From: Disability, quality of life, productivity impairment and employer costs of migraine in the workplaceSymptoms related to headache disorder on days when headaches are not experienced. M, migraine group; TTH, tension-type headache group; M/TTH, a group that satisfies the diagnostic criteria for migraine and tension-type headache; HA, a group that does not meet the diagnostic criteria for migraine or tension-type headacheBack to article page