Table 3
Clinical manifestations of Headache

Strength of headache	7.37±1.79
Duration of symptoms	Numbers
<2 hours	31 (41.9%)
2~4hours	11 (14.9%)
24~72hours	10 (13.5%)
4~24hours	5 (6.8%)
Frequency of symptoms	Numbers
1/month	29 (39.2%)
1~14/month	20 (27.0%)
>15/month	4 (5.4%)