Figure 3. Participants who achieved a ≥50% treatment response with noninvasive vagus nerve stimulation (nVNS) (per-protocol completer population).

^aThe 2-, 4-, and 6-month completers were from the 59 participants initially randomized to either nVNS or sham treatment. ^bThe 8-month completers were from the 30 participants initially randomized to nVNS treatment. ^cOne participant who completed 8 months of nVNS initiated gabapentin treatment during the study and was therefore excluded from 8-month completer analyses.