Table 4 Number of dropouts due to adverse/side-effects (Tolerability) or any other reason (Accessibility) in the eTNS and comparator arms.

Dropout type	Disorder	Comparison	eTNS N		Comparator N
Dropout type	Disorder	Comparison	Dropouts	Non-dropouts^a	Dropout	Non-dropouts^a
Tolerability
DeGiorgio et al. [61]	Epilepsy	120 vs 2 Hz eTNS	2	17	0	25
Chen et al. [82]	Migraine	100 Hz eTNS + FLZ vs Fz	1	29	0	30
Chou et al. [39]	Migraine	100 Hz vs 3 Hz eTNS	5	47	2	52
Hokenek et al. [40]	Migraine	50 Hz vs sham eTNS	3	39	2	39
Jiang et al. [42]	Migraine	eTNS + FLZ vs FLZ	2	55	3	52
Accessibility
DeGiorgio et al. [61]	Epilepsy	120 vs 2 Hz eTNS	6	17	25	25
W Gao et al. [84]	Chronic headache	MK-MT11 vs STX-Med Sprl	3	57	5	55
Kuruvilla et al. [85]	Migraine	100 vs 3 Hz eTNS	20	259	250	279

^aDoes not include participants that were excluded but did not dropout (e.g., data was not available due to technical issues).

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