Table 1.

Average scores on side effects on a scale from 1 (= not present) to 10 (= extremely noticeable).

Measure	Sham	Stimulation	p-value
Headache	1.7 ± 1.3	1.3 ± 1.0	0.369
Neck pain	1.2 ± 0.5	1.1 ± 0.3	0.781
Scalp pain	2.4 ± 1.7	2.6 ± 2.3	0.805
Tingling	5.1 ± 3.2	5.9 ± 2.7	0.398
Itching	4.3 ± 2.7	3.1 ± 3.1	0.219
Burning sensation	3.2 ± 2.6	3.1 ± 3.1	0.873
Skin redness	1.0 ± 0.0	1.0 ± 0.0	*
Sleepiness	3.6 ± 2.4	4.3 ± 2.9	0.429
Trouble concentrating	3.8 ± 2.9	2.8 ± 1.7	0.200
Acute mood change	1.1 ± 0.5	1.5 ± 1.2	0.189

Mean ± standard deviations are reported. *T-value cannot be computed because the standard deviations of both groups are 0.