Table 6.

Differences between before and after treatment regarding headache frequency in each group and comparison of all groups

	Menthol	Lidocaine	Placebo	P
Before	4.84±1.64	5.46±2.05	4.88±1.4	0.170
After	2.58±1.78	2.71±2.40	2.13±1.67	0.731
P-value	P < 0.0001	P < 0.0001	P < 0.0001
Difference (before−after)	2.26±2.19	2.76±2.60	1.95±1.67	0.248