Table 3.

Qualitative analysis of changes in CH attack frequency, duration, and severity with nVNS therapy

	No. (%) of Patients
	Decrease	No Change	Increase
Frequency	25a (83)	5 (17)	0
Durationb	17 (65)	7 (27)	2 (8)
Severityc	17 (74)	5 (22)	1 (4)

^aIncluded 3 patients who had no CH attacks during the evaluation period

^b26 patients had available qualitative data on attack duration

^c23 patients had available qualitative data on attack severity

Abbreviations: CH cluster headache, nVNS non-invasive vagus nerve stimulation