A California handedness study involved 199 male and 74 female cluster headache sufferers as well as 477 migraineurs. Earlier reported data indicated that cluster headache patients had a left-handedness prevalence of over 15%. With the current data the prevalence in males was 11.0% and in females, 8.2%. The corresponding migraine figures were 11.8% and 8.1%. The cluster and migraine headache groups did not differ significantly from each other or from the expected 10% frequency of left-handedness in either sex.
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