Comparison 1. TENS versus sham TENS.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Pain (VAS) (at short term)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
1.1 Conventional TENS	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
1.2 Burst TENS	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
1.3 Acupuncture‐like TENS	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
2 Pain (percentage of participants presenting improvement of pain) (short term)	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
3 Pain assessed by myometer score (short term)	1		Mean Difference (IV, Random, 95% CI)	Subtotals only