Table 1.

Mean subjective ratings (with standard errors in parentheses) for the stimulation side effects in the active stimulation condition and the sham stimulation condition.

	Active	Sham	p-value
Headache	1.83 (1.42)	2.03 (1.38)	0.58
Nausea	1.17 (0.75)	1.30 (0.75)	0.49
Dizziness	1.67 (1.15)	2.27 (1.55)	0.09
Neck pain	1.80 (1.49)	1.30 (0.75)	0.11
Neck contraction	2.27 (1.87)	1.93 (1.46)	0.44
Stinging sensation	2.87 (1.94)	2.80 (1.73)	0.93
Ear irritation	1.77 (1.45)	1.93 (1.55)	0.67
Concentration	2.97 (1.65)	3.47 (1.68)	0.25
Fluctuation of feelings	1.53 (1.01)	1.73 (1.34)	0.51
Unpleasant feelings	1.67 (1.15)	2.23 (1.45)	0.10

Ratings were scored on a seven-point scale, with 1 being not at all and 7 very much.