Table I

Time cycles headache of participants presented as a percent

Time cycles headachen (%)
Morning headache
Yes547 (32.1)
No1,158 (67.9)
Daytime headache
Yes515 (30.2)
No1,190 (69.8)
Evening headache
Yes553 (32.4)
No1,152 (67.6)
Nocturnal headache
Yes90 (5.3)
No1,615 (94.7)

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