Fig. 1
From: Long-term outcomes of occipital nerve stimulation for chronic migraine: a cohort of 53 patients
Changes in moderate-to-severe headache days following occipital nerve stimulation. a Improvement of moderate-to-severe headache days of whole cohort over follow-up period. b Improvement in moderate-to-severe headache days of those with chronic migraine alone compared to those with multiple phenotypes over follow-up period. Table provides number of subjects included at each time point