Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

60 questions · 67 findings · 7 reviews

No studies found 18 · 26.9%GRADE not reported 0 · 0%Very low 26 · 38.8%Low 10 · 14.9%Moderate 12 · 17.9%High 1 · 1.5%

tDCS vs sham

Patient‐reported pain intensity or pain relief (VAS, NRS or categorical scale) · adults with chronic pain

It is very uncertain whether transcranial direct current stimulation (tDCS) changes pain intensity (0 to < 1 week postintervention) measured using… compared with sham (very low certainty).

1 finding from 1 review