FIGURE 4.

Migraine preventive medication eligibility and currently taking migraine preventive medication, stratified by monthly headache day frequency (N = 21,143). CM, chronic migraine (≥15 monthly headache days); HFEM, high frequency episodic migraine (8–14 monthly headache days); LFEM, low frequency episodic migraine (0–3 monthly headache days); MFEM, moderate frequency episodic migraine (4–7 monthly headache days). ^aPreventive eligibility considered monthly headache days and Migraine Disability Assessment (MIDAS) disability grade. ¹⁰ , ¹¹ , ¹⁵ Eligibility was defined three ways: ≥6 monthly headache days, 4–5 monthly headache days with at least some disability (MIDAS ≥6), or 3 monthly headache days with severe disability (MIDAS ≥21). ^bCurrently taking was defined as “taken or used in the last 3 months.” Migraine preventive medication eligibility considered disability and monthly headache day frequency as specified by the American Headache Society. ¹⁵ Currently taking migraine preventive medication use was defined as use within the last 3 months for migraine and is reflective of the percentage among the overall total population within that monthly headache day frequency (regardless of current eligibility for migraine preventive medication)