Table 2 Prevalence of migraine before and after percutaneous patent foramen ovale closure

Study	n	Follow-up (months)	Before closure		After closure
Study	n	Follow-up (months)	Migraine	Migraine with aura	Migraine	Migraine with aura
Wilmshurst et al87	37	17	57	43	30*	24*
Schwerzmann et al88	215	24	22	17	20	15
Post et al89	66	6	39	18	16*	5*
Azarbal et al90	66	3	45	30	17	8
Reisman et al91	162	9	35	24	≈15	Not reported
Giardini et al92	131	20	Not reported	27	Not reported	5*
Slavin et al93	120	30	42	33	≈14	≈10
Morandi et al,94 prospective	17	6	100	47	71*	12*
Anzola et al,68 prospective	50	12	100	66	64*	44*

Results are shown as percentages.
*p<0.05.