Cluster headache in Greece: an observational clinical and demographic study of 302 patients.

The male to female ratio was found to decrease with the decade of onset, from 6:1 for onset before 1989, to 4.3:1 for onset between 1990 and 1999, 4.2:1 for onset from 2000 to 2009 and 2.3/1 for onset since 2010, though this change did not reach statistical significance ( p = 0.139) (Table 1 ).

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