Comparison 1. Electrical Stimulation (10 Hz) versus Placebo (End of treatment ‐ 10 weeks).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Grip Strength	1	9	Mean Difference (IV, Fixed, 95% CI)	4.0 [‐5.70, 13.70]
2 Button Test	1	9	Mean Difference (IV, Fixed, 95% CI)	0.0 [0.0, 0.0]
3 Ulnar Deviation of the Index Finger	1	9	Mean Difference (IV, Fixed, 95% CI)	14.00 [‐4.30, 32.30]
4 Profundus Pinch Strength	1	9	Mean Difference (IV, Fixed, 95% CI)	0.0 [‐7.29, 7.29]
5 Superficialis Pinch Strength	1	9	Mean Difference (IV, Fixed, 95% CI)	21.0 [17.61, 24.39]
6 Maximum Voluntary Force Generated by the Index Finger During Isometric Abduction	1	9	Mean Difference (IV, Fixed, 95% CI)	0.0 [‐7.20, 7.20]
7 Fatigue Resistance of the First Dorsal Interosseous During Sustained Maximum Voluntary Contraction	1	9	Mean Difference (IV, Fixed, 95% CI)	19.0 [10.68, 27.32]