Table 3.

Internal jugular valve vein incompetence: mean values of flow duration ± SD in seconds

Study groups	Bilateral or unilateral IJVVI	Bilateral IJVVI
M n = 70	2.4 ± 0.8*	4.8 ± 1.65*
MO n = 44	2.6 ± 0.9*	5.1 ± 1.6*
MA n = 26	1.9 ± 0.3*	3*
Control group n = 42	2.2 ± 1*	5.1 ± 1.2*

M all patients with migraine; MO patients with migraine without aura;

MA patients with migraine with aura;

^*no difference between the study groups p > 0.05.