Table 2 Demographic characteristics and headache history (randomized patients dataset; n = 99)

Gender, n (%)

 Male

40 (40.4)

 Female

59 (59.6)

Age, years

 Mean ± SD

35.1 ± 10.19

 Range

19–64

Race, n (%):

 Caucasian

98 (99.0)

 Other

1 (1.0)

Headache duration, years

 Mean ± SD

22.2 ± 9.09

 Range

6–44

Mean number of days with tension-type headache per month, n (%)

 <4

2 (2.0)

 4–14

97 (98.0)

 >14

–

Usual pain intensity, n (%)

 Mild

21 (21.2)

 Moderate

75 (75.8)

 Severe

3 (3.0)