Table 4.

Proportion of participants who reported experiencing side effects following stimulation.

Group	Stimulation	Expectation priming	Itchiness	Warmth / heat	Pinching	Pain	Iron taste	Fatigue
1	Active	High	1/8 (13%)	4/8 (50%)	2/8 (25%)	0/8 (0%)	0/8 (0%)	1/8 (13%)
2	Active	Low	8/11 (73%)	7/11 (64%)	2/11 (18%)	1/11 (9%)	1/11 (9%)	2/11 (18%)
3	Sham	High	5/13 (38%)	10/13 (77%)	6/13 (46%)	1/13 (8%)	2/13 (15%)	0/13 (0%)
4	Sham	Low	3/8 (38%)	2/8 (25%)	3/8 (38%)	0/8 (0%)	0/8 (0%)	1/8 (13%)

Reports of side effects did not differ based on stimulation or expectation condition; data missing from 23 participants who did not receive these questions during the experiment.