Table 3.

Comparison of headache characteristics among both groups

Variable	Mean±SD				P* (time)	P* (time×intervention)	P* (intervention)
	Before	1 month	2 months	3 months
Headache frequency (month)
Group 1	7.99±1.67	7.20±1.60	5.90±1.34	4.63±0.92	<0.001	0.24	0.62
Group 2	8.06±1.99	7.26±2.01	5.77±1.74	3.90±1.26	<0.001
P**	0.83	0.88	0.68	0.26
Duration of headache (day)
Group 1	1.43±0.83	1.34±0.74	0.80±0.38	0.69±0.29	<0.001	0.34	0.69
Group 2	1.44±0.75	1.24±0.57	0.78±0.45	0.61±0.31	<0.001
P**	0.98	0.52	0.87	0.34
Headache intensity
Group 1	8.08±1.59	7.30±1.48	6.96±1.65	4.20±0.84	<0.001	0.32	0.01
Group 2	7.97±1.62	6.63±1.37	5.76±1.35	3.06±0.90	<0.001
P**	0.81	0.07	0.06	0.06
HIT score
Group 1	21.26±3.58	18.90±2.78	17.63±3.44	15.51±4.58	<0.001	0.12	0.001
Group 2	22.23±2.59	17.33±2.61	14.56±2.17	10.33±2.26	<0.001
P**	0.19	0.12	0.14	0.07

*P-value using repeated measure test, **P-value using independent-t-test. SD=Standard deviation, HIT=Headache impact test