Fig. 2

Clinical effect at group and individual level. GON block was effective in reduce the average clincial burden of chronic migraine by 35%. More over we observed that after GON-B the majority of patients who responded reversed to EM. Only one case had a 15 days reduction but passed from 30 days to 15 days of headache remaining within the boundary of chronic migraine. Most of patients, who didn’t respond, had no benefit (five of them are 30 days to 30 days and then superimposed in the graph). Two Responders passed from 15 days to 6 days and are superimposed in the graph. Responders are in dotted, No-responders in continuous line