Table 1.

Age of onset of cluster headache by sex and subtypes

		Mean (yrs)			SD (yrs)
		Males	Females	Total	Males	Females	Total
Episodic		29.7	29.0 (1)	29.5	12.9	14.2	13.3
Chronic
	All chronic	32.0	37.2 (1)	33.9	13.4	21.1	16.6
	Primary	35.7	42.8	38.5	16.3	21.7	18.8
	Secondary	28.9	30.8	29.5	9.5	18.9	13.1
Total		30.1	30.4	30.2	13.0	15.7	13.8

(1) Student’s test: episodic cluster headache vs chronic cluster headache among females p = 0.004