Relationship between Vitamin D Receptor Gene Polymorphisms and Migraine without Aura in an Iranian Population

Table 2

Demographic and clinical characteristics of patients with migraine.

Characteristic	Mean ± S.E. or percentage
Frequency of headache per month	8.32±0.81
Family history for migraine
Positive	77%
Negative	23%
Menstrual effect on the headache aggravation
Yes	52%
No	48%
Total HIT-6 score	53.51±1.93

HIT-6: headache impact test-6.