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Fig. 2 | The Journal of Headache and Pain

Fig. 2

From: Post-angiography headaches

Fig. 2

Relation of headache diagnosis 6 months after the procedure to previous headache history; X axis: headaches the 6 months revaluation; H free: headache-free without headaches; M: missing data; Z axis: recurrent headaches before the procedure; P H free: previously headache free; P secondary: previous secondary headache; P tension-type: previous tension-type headache; P migraine: previous migraine, M: missing; Y axis: number of patients in groups, as depicted in the gray-shaded legend

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