Table 4. The 6-Item Headache Impact Test before and after treatment and its percentage of change in the three study groups.

	Group A n=16	Group B n=16	Group C n=16
6-Item Headache Impact Test
Before treatment	67.5 ± 3.4	67.4 ± 3.4	67.1 ± 3.6
After treatment	44.1 ± 2.1*†	43.7 ± 2.2‡	37.8 ± 1.4
% of change	34.4 ± 5.1*†	35.0 ± 3.8‡	43.6 ± 3.7

Data are expressed as mean ± SD.

*Significant difference between the three groups

†Significant difference between Group A and Group C.

‡Significant difference between Group B and Group C.