Comparison 3. TENS to the head Vs placebo (immediate effect).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Motivation	1	27	Mean Difference (IV, Fixed, 95% CI)	‐0.85 [‐1.17, ‐0.53]
2 Behaviour disorder	1	27	Mean Difference (IV, Fixed, 95% CI)	0.09 [‐0.24, 0.42]
3 Sleep disorder	1	27	Mean Difference (IV, Fixed, 95% CI)	0.05 [‐0.28, 0.38]
4 Intelligence	1	27	Mean Difference (IV, Fixed, 95% CI)	0.08 [‐0.28, 0.44]
5 Emotion	1	27	Mean Difference (IV, Fixed, 95% CI)	‐0.04 [‐0.34, 0.26]
6 Language	1	27	Mean Difference (IV, Fixed, 95% CI)	‐0.09 [‐0.37, 0.19]
7 Neurological signs	1	27	Mean Difference (IV, Fixed, 95% CI)	‐0.07 [‐0.23, 0.09]
8 Subjective complaints	1	27	Mean Difference (IV, Fixed, 95% CI)	0.01 [‐0.17, 0.19]
9 Activities of daily life	1	27	Mean Difference (IV, Fixed, 95% CI)	‐0.03 [‐0.46, 0.40]