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. 2023 Mar 21;100(12):e1207–e1220. doi: 10.1212/WNL.0000000000201688

Figure 2. Diurnal and Annual Reoccurrence of Cluster Headache Attacks and Bouts.

Figure 2

(A) Participant frequency of attack distributions over 24 hours in 2-hour intervals for patients reporting diurnal rhythmicity. Data from 565 participants with cluster headache (350 male/215 female). Attack distribution by time of day differs significantly between male and female participants (p = 0.002). (B) Participant frequency of bout distribution over the year in months for patients reporting annual rhythmicity. Data from 145 participants with cluster headache (88 male/57 female). Bout distribution by month did not differ between male and female participants (p = 0.72).