Table 1. Demographics and Group Variation of Tension-Type Headache and Migraine Sufferers.

	Tension-Type Headache n = 22			Migraine Headache n = 33
	n; Mean	%; SD	Range; Range of means	n; Mean	%; SD	Range; Range of means
Demographic
Gender
Female	17	77.3%	----	29	87.9%	----
Male	5	22.7%	----	4	12.1%	----
Ethnicity
Caucasian	21	95.5%	----	29	87.9%	----
African-American	1	4.5%	----	4	12.1%	----
Age	45.0	12.4	30 to 69	43.3	13.5	24 to 70
Group Variation
HAS
Means	10.3	6.0	2.2 to 27.9	10.8	6.2	2.2 to 27.5
SDs†	5.7	2.2	3.1 to 10.8	5.9	2.1	2.1 to 10.0
Sleep
Means	6.7	0.82	5.7 to 8.1	7.1	0.91	4.8 to 8.5
SDs†	1.2	0.46	0.53 to 2.1	1.4	0.51	0.31 to 2.4
AIR
Means	2.3	0.75	1.3 to 3.8	2.5	0.97	0.7 to 4.4
SDs†	0.67	0.32	0.3 to 1.5	0.82	0.37	0.3 to 1.5

^†Reflects the aggregate of individual participants' standard deviations