Fig. 1From: Should migraine without aura be further divided? A study of 1444 female patients with migraine without auraSchematic diagrame of patients grouping. The patients were grouped according to the association of migraine onset with menarche and childbirth. Patients were divided into three groups: migraine onset before menarche (group J1), onset between menarche and childbirth (group J2) and onset after childbirth (group J3). The expected incidence rate is symbolically sketched by a dotted lineBack to article page