Eichhorn 2003.

Methods	RCT with 3 treatment groups. Patients allocated to ECTR but undergoing OCTR were excluded from the study.
Participants	Electrophysiologically confirmed CTS. 11% treated bilaterally.
Interventions	(1) ECTR: two‐portal extrabursal Chow technique (110 patients, 125 hands). (2) OCTR (54 patients, 60 hands). (3) OCTR with modified incision (63 patients, 65 hands).
Outcomes	Overall improvement.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear