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Distribution of neurosonological venous hemodynamic criteria (VH1–VH5) in the sample populations.
| VH1 | VH2 | VH3 | VH4 | VH5 | |
|---|---|---|---|---|---|
| CM (n=33) | 30.3% | - | 63.6% | 27.2% | - |
| EM (n=29) | 20.6% | - | 75.8% | 6.8% | - |
| HCs (n=21) | - | - | 31% | - | - |
Abbreviations: CM=chronic migraine; EM=episodic migraine; HCs=healthy controls
