Table 1 Demographics and clinical features of patients with and without follow-up

CharacteristicsFollow-up, n = 450No follow-up, n = 82p Value*
* p Values from Student t-test for continuous and χ quadrate for categorical variables.
TTH = tension-type headache.
Age, y42.4 ± 11.840.8 ± 8.70.25
Gender, %
    Women84.184.50.76
    Men15.915.5
Headache type, %
    Migraine88.2900.66
    Migraine + TTH11.810
Headache frequency, d/mo6.8 ± 4.07.2 ± 3.90.37
Duration of headache, y19.2 ± 12.317.9 ± 10.00.14