“…26,49 Overall, TENS showed conflicting evidence of efficacy. Twenty-four trials reported positive outcomes 28,33,[36][37][38][39][41][42][43]45,[47][48][49][50]52,53,[55][56][57][58]61,64,65 (ie, a significant difference favoring TENS compared with an inactive control) and 19 trials reported negative outcomes 26,27,[29][30][31][32]34,35,40,44,46,51,54,59,60,62,63,66 (ie, no difference between TENS and an inactive control). No trials reported a significant difference favoring the control group.…”