Table 3. Impact of sex on circle of Willis morphology.

	Anterior portion COW incomplete	p	Posterior portion COW incomplete	P	Overall COW incomplete	P
Overall cohort
Female (%)	30/132 (23)	0.84	66/132 (50)	0.02	82/132 (60)	0.03
Male (%)	18/38 (21)		27/38 (71)		30/38 (79)
Controls
Female (%)	5/38 (13)	0.99	12/38 (32)	0.02	17/38 (45)	0.15
Male (%)	2/15 (13)		10/15 (67)		10/15 (67)
MWA
Female (%)	14/48 (29)	0.24	30/48 (62)	0.47	33/48 (69)	0.06
Male (%)	4/8 (50)		6/8 (75)		8/8 (100)
MwoA
Female (%)	11/46 (24)	0.38	24/46 (52)	0.15	29/46 (63)	0.22
Male (%)	2/15 (13)		11/15 (73)		12/15 (80)

Abbreviations: MWA, migraine with aura; MwoA, migraine without aura; COW, circle of Willis.